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
Item 88324
2917.53/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
2917.53/Each
3" NPT VBS CPVC Diaphragm Vacuum Breaker with FKM Seals
Item 88323
1833.56/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
1833.56/Each
1/2" NPT VBM GFPP Diaphragm Vacuum Breaker with EPDM Diaphragm
Item 88325
240.07/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
240.07/Each
1" NPT VBM GFPP Diaphragm Vacuum Breaker with EPDM Diaphragm
Item 88327
347.85/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
347.85/Each
3/4" NPT VBM GFPP Diaphragm Vacuum Breaker with EPDM Diaphragm
Item 88326
289.07/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
289.07/Each
3/4" NPT VBM CPVC Diaphragm Vacuum Breaker with FKM Diaphragm
Item 88319
324.58/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
324.58/Each
1/2" NPT VBM CPVC Diaphragm Vacuum Breaker with FKM Diaphragm
Item 88318
264.56/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
264.56/Each
1" NPT VBM CPVC Diaphragm Vacuum Breaker with FKM Diaphragm
Item 88320
372.35/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
372.35/Each
2" NPT VBS CPVC Diaphragm Vacuum Breaker with FKM Seals
Item 88322
961.49/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
961.49/Each
1-1/2" NPT VBS CPVC Diaphragm Vacuum Breaker with FKM Seals
Item 88321
725.08/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
725.08/Each
1-1/2" NPT VBS Polypropylene Diaphrgm Vacuum Breaker with EPDM Seals
Item 88328
679.78/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
679.78/Each
1-1/2" NPT VBS Polypropylene Diaphrgm Vacuum Breaker with FKM Seals
Item 88335
690.8/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
690.8/Each
1" NPT VBM GFPP Diaphragm Vacuum Breaker with FKM Diaphragm
Item 88334
353.98/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
353.98/Each
2" NPT VBS Polypropylene Diaphrgm Vacuum Breaker with FKM Seals
Item 88336
840.22/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
840.22/Each
4" NPT VBS Polypropylene Diaphrgm Vacuum Breaker with FKM Seals
Item 88338
2139.77/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
2139.77/Each
3" NPT VBS Polypropylene Diaphrgm Vacuum Breaker with FKM Seals
Item 88337
1609.42/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
1609.42/Each
3" NPT VBS Polypropylene Diaphrgm Vacuum Breaker with EPDM Seals
Item 88330
1586.15/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
1586.15/Each
2" NPT VBS Polypropylene Diaphrgm Vacuum Breaker with EPDM Seals
Item 88329
809.61/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
809.61/Each
4" NPT VBS Polypropylene Diaphrgm Vacuum Breaker with EPDM Seals
Item 88331
2042.97/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
2042.97/Each
3/4" NPT VBM GFPP Diaphragm Vacuum Breaker with FKM Diaphragm
Item 88333
296.41/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
296.41/Each
1/2" NPT VBM GFPP Diaphragm Vacuum Breaker with FKM Diaphragm
Item 88332
246.19/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
246.19/Each
3" NPT VBS PVC Diaphragm Vacuum Breaker with EPDM Seals
Item 88303
1226.05/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
1226.05/Each
2" NPT VBS PVC Diaphragm Vacuum Breaker with EPDM Seals
Item 88302
651.61/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
651.61/Each
4" NPT VBS PVC Diaphragm Vacuum Breaker with EPDM Seals
Item 88304
1615.54/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
1615.54/Each
3/4" NPT VBM PVC Diaphragm Vacuum Breaker with FKM Diaphragm
Item 88306
200.88/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
200.88/Each
1/2" NPT VBM PVC Diaphragm Vacuum Breaker with FKM Diaphragm
Item 88305
169.02/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
169.02/Each
1/2" NPT VBM PVC Diaphrgm Vacuum Breaker with EPDM Diaphragm
Item 88298
160.45/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
160.45/Each
1/2" NPT VBM CPVC Diaphragm Vacuum Breaker with EPDM Diaphragm
Item 88297
254.77/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
254.77/Each
3/4" NPT VBM PVC Diaphragm Vacuum Breaker with EPDM Diaphragm
Item 88299
192.3/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
192.3/Each
1-1/2" NPT VBS PVC Diaphragm Vacuum Breaker with EPDM Seals
Item 88301
504.61/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
504.61/Each
1" NPT VBM PVC Diaphragm Vacuum Breaker with EPDM Diaphragm
Item 88300
224.15/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
224.15/Each
1" NPT VBM PVC Diaphragm Vacuum Breaker with FKM Diaphragm
Item 88307
230.27/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
230.27/Each
1-1/2" NPT VBS CPVC Diaphragm Vacuum Breaker with EPDM Seals
Item 88314
715.3/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
715.3/Each
1" NPT VBM CPVC Diaphragm Vacuum Breaker with EPDM Diaphragm
Item 88313
361.33/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
361.33/Each
2" NPT VBS CPVC Diaphragm Vacuum Breaker with EPDM Seals
Item 88315
951.67/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
951.67/Each
4" NPT VBS CPVC Diaphragm Vacuum Breaker with EPDM Seals
Item 88317
2873.43/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
2873.43/Each
3" NPT VBS CPVC Diaphragm Vacuum Breaker with EPDM Seals
Item 88316
1822.54/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
1822.54/Each
2" NPT VBS PVC Diaphragm Vacuum Breaker with FKM Seals
Item 88309
660.18/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
660.18/Each
1-1/2" NPT VBS PVC Diaphragm Vacuum Breaker with FKM Seals
Item 88308
511.98/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
511.98/Each
3" NPT VBS PVC Diaphragm Vacuum Breaker with FKM Seals
Item 88310
1255.45/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
1255.45/Each
3/4" NPT VBM CPVC Diaphragm Vacuum Breaker with EPDM Diaphragm
Item 88312
316.01/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
316.01/Each
4" NPT VBS PVC Diaphragm Vacuum Breaker with FKM Seals
Item 88311
1662.09/Each
Save 5% when you buy 2+
Save 10% when you buy 4+
Save 15% when you buy 12+
P-478
1662.09/Each