Plast-O-Matic VBM & VBS Diaphragm Vacuum Breakers

These valves protect enclosed tanks from collapse or structural damage during draining. They also eliminate the siphoning of dangerous fluids and prevent vacuuming, which can cause damage to sensitive instruments and filters.

  • PVC, CPVC, polypropylene, or glass-filled polypropylene
  • EPDM or FKM
  • The VBS series features a corrosion-resistant PFA encapsulated spring which acts on a poppet seal
  • Dependable, repetitive, bubble-tight sealing
  • Only one moving part – the patented self-sealing diaphragm
  • Normally-closed design
  • Begin to break a vacuum at approximately 2" Hg (1.0 psi or 0.07 Bar negative pressure)
  • Threaded connections
  • Maximum pressure: 100 psi @ 75°F
  • Maximum temperature: 140°F (PVC) & 180°F (PP & CPVC)
Stock Description Catalog Pg. Price
4" NPT VBS CPVC Diaphragm Vacuum Breaker with FKM Seals
88324
$2,570.24/Each
Save 5%2+$2441.72/Each
Save 10%4+$2313.21/Each
Save 15%12+$2184.70/Each
P-467
$2,570.24/Each
3" NPT VBS CPVC Diaphragm Vacuum Breaker with FKM Seals
88323
$1,614.88/Each
Save 5%2+$1534.13/Each
Save 10%4+$1453.39/Each
Save 15%12+$1372.64/Each
P-467
$1,614.88/Each
1/2" NPT VBM GFPP Diaphragm Vacuum Breaker with EPDM Diaphragm
88325
$211.05/Each
Save 5%2+$200.49/Each
Save 10%4+$189.94/Each
Save 15%12+$179.39/Each
P-467
$211.05/Each
1" NPT VBM GFPP Diaphragm Vacuum Breaker with EPDM Diaphragm
88327
$307.15/Each
Save 5%2+$291.79/Each
Save 10%4+$276.43/Each
Save 15%12+$261.07/Each
P-467
$307.15/Each
3/4" NPT VBM GFPP Diaphragm Vacuum Breaker with EPDM Diaphragm
88326
$256.28/Each
Save 5%2+$243.46/Each
Save 10%4+$230.65/Each
Save 15%12+$217.83/Each
P-467
$256.28/Each
3/4" NPT VBM CPVC Diaphragm Vacuum Breaker with FKM Diaphragm
88319
$284.54/Each
Save 5%2+$270.31/Each
Save 10%4+$256.08/Each
Save 15%12+$241.85/Each
P-467
$284.54/Each
1/2" NPT VBM CPVC Diaphragm Vacuum Breaker with FKM Diaphragm
88318
$233.66/Each
Save 5%2+$221.97/Each
Save 10%4+$210.29/Each
Save 15%12+$198.61/Each
P-467
$233.66/Each
1" NPT VBM CPVC Diaphragm Vacuum Breaker with FKM Diaphragm
88320
$327.88/Each
Save 5%2+$311.48/Each
Save 10%4+$295.09/Each
Save 15%12+$278.69/Each
P-467
$327.88/Each
2" NPT VBS CPVC Diaphragm Vacuum Breaker with FKM Seals
88322
$847.96/Each
Save 5%2+$805.56/Each
Save 10%4+$763.16/Each
Save 15%12+$720.76/Each
P-467
$847.96/Each
1-1/2" NPT VBS CPVC Diaphragm Vacuum Breaker with FKM Seals
88321
$638.78/Each
Save 5%2+$606.84/Each
Save 10%4+$574.90/Each
Save 15%12+$542.96/Each
P-467
$638.78/Each
1-1/2" NPT VBS PP Diaphrgm Vacuum Breaker with EPDM Seals
88328
$602.99/Each
Save 5%2+$572.84/Each
Save 10%4+$542.69/Each
Save 15%12+$512.54/Each
P-467
$602.99/Each
1-1/2" NPT VBS PP Diaphrgm Vacuum Breaker with FKM Seals
88335
$614.30/Each
Save 5%2+$583.58/Each
Save 10%4+$552.87/Each
Save 15%12+$522.15/Each
P-467
$614.30/Each
1" NPT VBM GFPP Diaphragm Vacuum Breaker with FKM Diaphragm
88334
$312.81/Each
Save 5%2+$297.17/Each
Save 10%4+$281.52/Each
Save 15%12+$265.88/Each
P-467
$312.81/Each
2" NPT VBS PP Diaphrgm Vacuum Breaker with FKM Seals
88336
$748.07/Each
Save 5%2+$710.66/Each
Save 10%4+$673.26/Each
Save 15%12+$635.86/Each
P-467
$748.07/Each
4" NPT VBS PP Diaphrgm Vacuum Breaker with FKM Seals
88338
$1,901.30/Each
Save 5%2+$1806.23/Each
Save 10%4+$1711.17/Each
Save 15%12+$1616.10/Each
P-467
$1,901.30/Each
3" NPT VBS PP Diaphrgm Vacuum Breaker with FKM Seals
88337
$1,430.22/Each
Save 5%2+$1358.70/Each
Save 10%4+$1287.19/Each
Save 15%12+$1215.68/Each
P-467
$1,430.22/Each
3" NPT VBS PP Diaphrgm Vacuum Breaker with EPDM Seals
88330
$1,411.37/Each
Save 5%2+$1340.80/Each
Save 10%4+$1270.23/Each
Save 15%12+$1199.66/Each
P-467
$1,411.37/Each
2" NPT VBS PP Diaphrgm Vacuum Breaker with EPDM Seals
88329
$719.82/Each
Save 5%2+$683.82/Each
Save 10%4+$647.83/Each
Save 15%12+$611.84/Each
P-467
$719.82/Each
4" NPT VBS PP Diaphrgm Vacuum Breaker with EPDM Seals
88331
$1,816.47/Each
Save 5%2+$1725.64/Each
Save 10%4+$1634.82/Each
Save 15%12+$1544.00/Each
P-467
$1,816.47/Each
3/4" NPT VBM GFPP Diaphragm Vacuum Breaker with FKM Diaphragm
88333
$263.81/Each
Save 5%2+$250.62/Each
Save 10%4+$237.42/Each
Save 15%12+$224.23/Each
P-467
$263.81/Each
1/2" NPT VBM GFPP Diaphragm Vacuum Breaker with FKM Diaphragm
88332
$216.70/Each
Save 5%2+$205.86/Each
Save 10%4+$195.03/Each
Save 15%12+$184.19/Each
P-467
$216.70/Each
3" NPT VBS PVC Diaphragm Vacuum Breaker with EPDM Seals
88303
$1,059.00/Each
Save 5%2+$1006.05/Each
Save 10%4+$953.10/Each
Save 15%12+$900.15/Each
P-467
$1,059.00/Each
2" NPT VBS PVC Diaphragm Vacuum Breaker with EPDM Seals
88302
$561.54/Each
Save 5%2+$533.46/Each
Save 10%4+$505.38/Each
Save 15%12+$477.30/Each
P-467
$561.54/Each
4" NPT VBS PVC Diaphragm Vacuum Breaker with EPDM Seals
88304
$1,396.30/Each
Save 5%2+$1326.48/Each
Save 10%4+$1256.67/Each
Save 15%12+$1186.85/Each
P-467
$1,396.30/Each
3/4" NPT VBM PVC Diaphragm Vacuum Breaker with FKM Diaphragm
88306
$173.37/Each
Save 5%2+$164.70/Each
Save 10%4+$156.03/Each
Save 15%12+$147.36/Each
P-467
$173.37/Each
1/2" NPT VBM PVC Diaphragm Vacuum Breaker with FKM Diaphragm
88305
$145.09/Each
Save 5%2+$137.83/Each
Save 10%4+$130.58/Each
Save 15%12+$123.32/Each
P-467
$145.09/Each
1/2" NPT VBM PVC Diaphrgm Vacuum Breaker with EPDM Diaphragm
88298
$139.44/Each
Save 5%2+$132.46/Each
Save 10%4+$125.49/Each
Save 15%12+$118.52/Each
P-467
$139.44/Each
1/2" NPT VBM CPVC Diaphragm Vacuum Breaker with EPDM Diaphragm
88297
$224.25/Each
Save 5%2+$213.03/Each
Save 10%4+$201.82/Each
Save 15%12+$190.61/Each
P-467
$224.25/Each
3/4" NPT VBM PVC Diaphragm Vacuum Breaker with EPDM Diaphragm
88299
$167.71/Each
Save 5%2+$159.32/Each
Save 10%4+$150.93/Each
Save 15%12+$142.55/Each
P-467
$167.71/Each
1-1/2" NPT VBS PVC Diaphragm Vacuum Breaker with EPDM Seals
88301
$435.27/Each
Save 5%2+$413.50/Each
Save 10%4+$391.74/Each
Save 15%12+$369.98/Each
P-467
$435.27/Each
1" NPT VBM PVC Diaphragm Vacuum Breaker with EPDM Diaphragm
88300
$194.10/Each
Save 5%2+$184.39/Each
Save 10%4+$174.69/Each
Save 15%12+$164.98/Each
P-467
$194.10/Each
1" NPT VBM PVC Diaphragm Vacuum Breaker with FKM Diaphragm
88307
$201.63/Each
Save 5%2+$191.54/Each
Save 10%4+$181.46/Each
Save 15%12+$171.38/Each
P-467
$201.63/Each
1-1/2" NPT VBS CPVC Diaphragm Vacuum Breaker with EPDM Seals
88314
$629.37/Each
Save 5%2+$597.90/Each
Save 10%4+$566.43/Each
Save 15%12+$534.96/Each
P-467
$629.37/Each
1" NPT VBM CPVC Diaphragm Vacuum Breaker with EPDM Diaphragm
88313
$316.58/Each
Save 5%2+$300.75/Each
Save 10%4+$284.92/Each
Save 15%12+$269.09/Each
P-467
$316.58/Each
2" NPT VBS CPVC Diaphragm Vacuum Breaker with EPDM Seals
88315
$838.52/Each
Save 5%2+$796.59/Each
Save 10%4+$754.66/Each
Save 15%12+$712.74/Each
P-467
$838.52/Each
4" NPT VBS CPVC Diaphragm Vacuum Breaker with EPDM Seals
88317
$2,532.56/Each
Save 5%2+$2405.93/Each
Save 10%4+$2279.30/Each
Save 15%12+$2152.67/Each
P-467
$2,532.56/Each
3" NPT VBS CPVC Diaphragm Vacuum Breaker with EPDM Seals
88316
$1,605.46/Each
Save 5%2+$1525.18/Each
Save 10%4+$1444.91/Each
Save 15%12+$1364.64/Each
P-467
$1,605.46/Each
2" NPT VBS PVC Diaphragm Vacuum Breaker with FKM Seals
88309
$570.96/Each
Save 5%2+$542.41/Each
Save 10%4+$513.86/Each
Save 15%12+$485.31/Each
P-467
$570.96/Each
1-1/2" NPT VBS PVC Diaphragm Vacuum Breaker with FKM Seals
88308
$442.82/Each
Save 5%2+$420.67/Each
Save 10%4+$398.53/Each
Save 15%12+$376.39/Each
P-467
$442.82/Each
3" NPT VBS PVC Diaphragm Vacuum Breaker with FKM Seals
88310
$1,085.38/Each
Save 5%2+$1031.11/Each
Save 10%4+$976.84/Each
Save 15%12+$922.57/Each
P-467
$1,085.38/Each
3/4" NPT VBM CPVC Diaphragm Vacuum Breaker with EPDM Diaphragm
88312
$275.12/Each
Save 5%2+$261.36/Each
Save 10%4+$247.60/Each
Save 15%12+$233.85/Each
P-467
$275.12/Each
4" NPT VBS PVC Diaphragm Vacuum Breaker with FKM Seals
88311
$1,435.87/Each
Save 5%2+$1364.07/Each
Save 10%4+$1292.28/Each
Save 15%12+$1220.49/Each
P-467
$1,435.87/Each

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