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Valvola di non ritorno pvc

(127 prodotti disponibili)

<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>Ritorno</strong></span> a Sfera in FRPP PVDF CPVC UPVC PPH <span class=keywords><strong>PVC</strong></span> - Product Image 1
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>Ritorno</strong></span> a Sfera in FRPP PVDF CPVC UPVC PPH <span class=keywords><strong>PVC</strong></span> - Product Image 2
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>Ritorno</strong></span> a Sfera in FRPP PVDF CPVC UPVC PPH <span class=keywords><strong>PVC</strong></span> - Product Image 3
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>Ritorno</strong></span> a Sfera in FRPP PVDF CPVC UPVC PPH <span class=keywords><strong>PVC</strong></span> - Product Image 4
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>Ritorno</strong></span> a Sfera in FRPP PVDF CPVC UPVC PPH <span class=keywords><strong>PVC</strong></span> - Product Image 5
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>Ritorno</strong></span> a Sfera in FRPP PVDF CPVC UPVC PPH <span class=keywords><strong>PVC</strong></span> - Product Image 6

Valvola di Non Ritorno a Sfera in FRPP PVDF CPVC UPVC PPH PVC

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0,2574-1,03 €
Ordine minimo: 1 parte
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>Ritorno</strong></span> a Sfera HK HK-4001 in <span class=keywords><strong>PVC</strong></span> con Porta da 1/2\", Uso Generale per Acqua, con Garanzia <span class=keywords><strong>di</strong></span> 3 Anni - Product Image 1
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>Ritorno</strong></span> a Sfera HK HK-4001 in <span class=keywords><strong>PVC</strong></span> con Porta da 1/2\", Uso Generale per Acqua, con Garanzia <span class=keywords><strong>di</strong></span> 3 Anni - Product Image 2
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>Ritorno</strong></span> a Sfera HK HK-4001 in <span class=keywords><strong>PVC</strong></span> con Porta da 1/2\", Uso Generale per Acqua, con Garanzia <span class=keywords><strong>di</strong></span> 3 Anni - Product Image 3
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>Ritorno</strong></span> a Sfera HK HK-4001 in <span class=keywords><strong>PVC</strong></span> con Porta da 1/2\", Uso Generale per Acqua, con Garanzia <span class=keywords><strong>di</strong></span> 3 Anni - Product Image 4
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>Ritorno</strong></span> a Sfera HK HK-4001 in <span class=keywords><strong>PVC</strong></span> con Porta da 1/2\", Uso Generale per Acqua, con Garanzia <span class=keywords><strong>di</strong></span> 3 Anni - Product Image 5
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>Ritorno</strong></span> a Sfera HK HK-4001 in <span class=keywords><strong>PVC</strong></span> con Porta da 1/2\", Uso Generale per Acqua, con Garanzia <span class=keywords><strong>di</strong></span> 3 Anni - Product Image 6

Valvola di Non Ritorno a Sfera HK HK-4001 in PVC con Porta da 1/2\", Uso Generale per Acqua, con Garanzia di 3 Anni

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0,3861-0,7293 €
Ordine minimo: 1000 parti
DKV 25/32/40/50mm <span class=keywords><strong>PVC</strong></span> <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> DN25 DN32 DN40 DN50 UPVC <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> <span class=keywords><strong>PVC</strong></span> Flap controllo <span class=keywords><strong>valvola</strong></span> unidirezionale <span class=keywords><strong>valvola</strong></span> - Product Image 1
DKV 25/32/40/50mm <span class=keywords><strong>PVC</strong></span> <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> DN25 DN32 DN40 DN50 UPVC <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> <span class=keywords><strong>PVC</strong></span> Flap controllo <span class=keywords><strong>valvola</strong></span> unidirezionale <span class=keywords><strong>valvola</strong></span> - Product Image 2
DKV 25/32/40/50mm <span class=keywords><strong>PVC</strong></span> <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> DN25 DN32 DN40 DN50 UPVC <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> <span class=keywords><strong>PVC</strong></span> Flap controllo <span class=keywords><strong>valvola</strong></span> unidirezionale <span class=keywords><strong>valvola</strong></span> - Product Image 3
DKV 25/32/40/50mm <span class=keywords><strong>PVC</strong></span> <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> DN25 DN32 DN40 DN50 UPVC <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> <span class=keywords><strong>PVC</strong></span> Flap controllo <span class=keywords><strong>valvola</strong></span> unidirezionale <span class=keywords><strong>valvola</strong></span> - Product Image 4
DKV 25/32/40/50mm <span class=keywords><strong>PVC</strong></span> <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> DN25 DN32 DN40 DN50 UPVC <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> <span class=keywords><strong>PVC</strong></span> Flap controllo <span class=keywords><strong>valvola</strong></span> unidirezionale <span class=keywords><strong>valvola</strong></span> - Product Image 5
DKV 25/32/40/50mm <span class=keywords><strong>PVC</strong></span> <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> DN25 DN32 DN40 DN50 UPVC <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> <span class=keywords><strong>PVC</strong></span> Flap controllo <span class=keywords><strong>valvola</strong></span> unidirezionale <span class=keywords><strong>valvola</strong></span> - Product Image 6

DKV 25/32/40/50mm PVC valvola di Non ritorno valvola di ritegno Non ritorno DN25 DN32 DN40 DN50 UPVC valvola di Non ritorno PVC Flap controllo valvola unidirezionale valvola

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2,48 €
Ordine minimo: 2 parti
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno in <span class=keywords><strong>PVC</strong></span> <span class=keywords><strong>di</strong></span> alta qualità <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno unidirezionale Flap/tipo a sfera per sistema <span class=keywords><strong>di</strong></span> tubazioni idrauliche-resistente e a prova <span class=keywords><strong>di</strong></span> perdite - Product Image 1
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno in <span class=keywords><strong>PVC</strong></span> <span class=keywords><strong>di</strong></span> alta qualità <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno unidirezionale Flap/tipo a sfera per sistema <span class=keywords><strong>di</strong></span> tubazioni idrauliche-resistente e a prova <span class=keywords><strong>di</strong></span> perdite - Product Image 2
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno in <span class=keywords><strong>PVC</strong></span> <span class=keywords><strong>di</strong></span> alta qualità <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno unidirezionale Flap/tipo a sfera per sistema <span class=keywords><strong>di</strong></span> tubazioni idrauliche-resistente e a prova <span class=keywords><strong>di</strong></span> perdite - Product Image 3
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno in <span class=keywords><strong>PVC</strong></span> <span class=keywords><strong>di</strong></span> alta qualità <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno unidirezionale Flap/tipo a sfera per sistema <span class=keywords><strong>di</strong></span> tubazioni idrauliche-resistente e a prova <span class=keywords><strong>di</strong></span> perdite - Product Image 4
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno in <span class=keywords><strong>PVC</strong></span> <span class=keywords><strong>di</strong></span> alta qualità <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno unidirezionale Flap/tipo a sfera per sistema <span class=keywords><strong>di</strong></span> tubazioni idrauliche-resistente e a prova <span class=keywords><strong>di</strong></span> perdite - Product Image 5
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno in <span class=keywords><strong>PVC</strong></span> <span class=keywords><strong>di</strong></span> alta qualità <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno unidirezionale Flap/tipo a sfera per sistema <span class=keywords><strong>di</strong></span> tubazioni idrauliche-resistente e a prova <span class=keywords><strong>di</strong></span> perdite - Product Image 6

Valvola di ritegno in PVC di alta qualità valvola di ritegno unidirezionale Flap/tipo a sfera per sistema di tubazioni idrauliche-resistente e a prova di perdite

0,4548-0,532 €
Ordine minimo: 200 parti
Valvole <span class=keywords><strong>di</strong></span> ritegno in <span class=keywords><strong>PVC</strong></span> <span class=keywords><strong>di</strong></span> alta qualità 4 pollici vendita calda fabbrica Design <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> per supporti <span class=keywords><strong>di</strong></span> Base - Product Image 1
Valvole <span class=keywords><strong>di</strong></span> ritegno in <span class=keywords><strong>PVC</strong></span> <span class=keywords><strong>di</strong></span> alta qualità 4 pollici vendita calda fabbrica Design <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> per supporti <span class=keywords><strong>di</strong></span> Base - Product Image 2
Valvole <span class=keywords><strong>di</strong></span> ritegno in <span class=keywords><strong>PVC</strong></span> <span class=keywords><strong>di</strong></span> alta qualità 4 pollici vendita calda fabbrica Design <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> per supporti <span class=keywords><strong>di</strong></span> Base - Product Image 3
Valvole <span class=keywords><strong>di</strong></span> ritegno in <span class=keywords><strong>PVC</strong></span> <span class=keywords><strong>di</strong></span> alta qualità 4 pollici vendita calda fabbrica Design <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> per supporti <span class=keywords><strong>di</strong></span> Base - Product Image 4
Valvole <span class=keywords><strong>di</strong></span> ritegno in <span class=keywords><strong>PVC</strong></span> <span class=keywords><strong>di</strong></span> alta qualità 4 pollici vendita calda fabbrica Design <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> per supporti <span class=keywords><strong>di</strong></span> Base - Product Image 5
Valvole <span class=keywords><strong>di</strong></span> ritegno in <span class=keywords><strong>PVC</strong></span> <span class=keywords><strong>di</strong></span> alta qualità 4 pollici vendita calda fabbrica Design <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> per supporti <span class=keywords><strong>di</strong></span> Base - Product Image 6

Valvole di ritegno in PVC di alta qualità 4 pollici vendita calda fabbrica Design valvola di Non ritorno per supporti di Base

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19,31 €
21,45 €
-10%
Ordine minimo: 1 parte
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>Ritorno</strong></span> per Piscina - Tipo a Molla Oscillante in <span class=keywords><strong>PVC</strong></span> Standard ANSI per Sistemi Manuali <span class=keywords><strong>di</strong></span> Flusso d'Acqua - Product Image 1
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>Ritorno</strong></span> per Piscina - Tipo a Molla Oscillante in <span class=keywords><strong>PVC</strong></span> Standard ANSI per Sistemi Manuali <span class=keywords><strong>di</strong></span> Flusso d'Acqua - Product Image 2
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>Ritorno</strong></span> per Piscina - Tipo a Molla Oscillante in <span class=keywords><strong>PVC</strong></span> Standard ANSI per Sistemi Manuali <span class=keywords><strong>di</strong></span> Flusso d'Acqua - Product Image 3
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>Ritorno</strong></span> per Piscina - Tipo a Molla Oscillante in <span class=keywords><strong>PVC</strong></span> Standard ANSI per Sistemi Manuali <span class=keywords><strong>di</strong></span> Flusso d'Acqua - Product Image 4
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>Ritorno</strong></span> per Piscina - Tipo a Molla Oscillante in <span class=keywords><strong>PVC</strong></span> Standard ANSI per Sistemi Manuali <span class=keywords><strong>di</strong></span> Flusso d'Acqua - Product Image 5

Valvola di Non Ritorno per Piscina - Tipo a Molla Oscillante in PVC Standard ANSI per Sistemi Manuali di Flusso d'Acqua

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2,58-4,29 €
Ordine minimo: 100 parti
<span class=keywords><strong>Di</strong></span> alta qualità DN400/16 pollici UPVC tipo Wafer <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno in <span class=keywords><strong>PVC</strong></span> verticale oscillazione <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> <span class=keywords><strong>di</strong></span> ritegno per acqua manuale <span class=keywords><strong>di</strong></span> alimentazione - Product Image 1
<span class=keywords><strong>Di</strong></span> alta qualità DN400/16 pollici UPVC tipo Wafer <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno in <span class=keywords><strong>PVC</strong></span> verticale oscillazione <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> <span class=keywords><strong>di</strong></span> ritegno per acqua manuale <span class=keywords><strong>di</strong></span> alimentazione - Product Image 2
<span class=keywords><strong>Di</strong></span> alta qualità DN400/16 pollici UPVC tipo Wafer <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno in <span class=keywords><strong>PVC</strong></span> verticale oscillazione <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> <span class=keywords><strong>di</strong></span> ritegno per acqua manuale <span class=keywords><strong>di</strong></span> alimentazione - Product Image 3
<span class=keywords><strong>Di</strong></span> alta qualità DN400/16 pollici UPVC tipo Wafer <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno in <span class=keywords><strong>PVC</strong></span> verticale oscillazione <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> <span class=keywords><strong>Non</strong></span> <span class=keywords><strong>ritorno</strong></span> <span class=keywords><strong>di</strong></span> ritegno per acqua manuale <span class=keywords><strong>di</strong></span> alimentazione - Product Image 4

Di alta qualità DN400/16 pollici UPVC tipo Wafer valvola di ritegno in PVC verticale oscillazione valvola di Non ritorno di ritegno per acqua manuale di alimentazione

8,83-9,25 €
Ordine minimo: 100 parti
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno manuale con <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno <span class=keywords><strong>di</strong></span> alta qualità a doppia flangiata in <span class=keywords><strong>PVC</strong></span> per applicazioni generali in acqua - Product Image 1
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno manuale con <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno <span class=keywords><strong>di</strong></span> alta qualità a doppia flangiata in <span class=keywords><strong>PVC</strong></span> per applicazioni generali in acqua - Product Image 2
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno manuale con <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno <span class=keywords><strong>di</strong></span> alta qualità a doppia flangiata in <span class=keywords><strong>PVC</strong></span> per applicazioni generali in acqua - Product Image 3
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno manuale con <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno <span class=keywords><strong>di</strong></span> alta qualità a doppia flangiata in <span class=keywords><strong>PVC</strong></span> per applicazioni generali in acqua - Product Image 4
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno manuale con <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno <span class=keywords><strong>di</strong></span> alta qualità a doppia flangiata in <span class=keywords><strong>PVC</strong></span> per applicazioni generali in acqua - Product Image 5
<span class=keywords><strong>Valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno manuale con <span class=keywords><strong>valvola</strong></span> <span class=keywords><strong>di</strong></span> ritegno <span class=keywords><strong>di</strong></span> alta qualità a doppia flangiata in <span class=keywords><strong>PVC</strong></span> per applicazioni generali in acqua - Product Image 6

Valvola di ritegno manuale con valvola di ritegno di alta qualità a doppia flangiata in PVC per applicazioni generali in acqua

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0,9867-30,53 €
Ordine minimo: 100 cartoni

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valvola acqua di non ritornovalvola x pentola a pressione lagostinavalvola di non ritorno acquedottovalvola di ritegno a palla in pvcvalvola di scarico acquavalvola acqua non ritornoprolunghe per valvole pneumaticivalvola per pentola pressione lagostinarilievo presenzevalvola di non ritorno 1valvola per coperchio pentola a pressione lagostinavalvola non ritorno acquavalvola per pentola a pressione lagostinavalvola di non ritorno acquavalvola di non ritorno acqua bricoman