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Vent-O-Mat series RBXc Air Release Air Valve

The original “Anti-Shock” & “Anti-Surge” air release and vacuum break valves for water, sewage, and effluent pipelines in FUSION BONDED EPOXY POWDER COATED ductile iron.
RBXc Air Release Air Valves


Size Range
1" (25mm) to 12" (300mm)
-40°F to 176°F
Max. Operating Pressure
Up to 1450psi (100bar) depending on size
Min. Operating Pressure
Flange Connection
ASME B-16.5
Flange Drilling
ANSI 150#, ANSI 300#, ANSI 600#, ANSI 900#
Body Material
Fusion Bonded Epoxy Powdercoated Ductile Iron
Flange Material
Fusion Bonded Epoxy Powdercoated Ductile Iron
Top Cover
Fusion Bonded Epoxy Powdercoated Mild Steel
Float Material
High Density Polyethylene (solid)
Bleed Port
O-Rings & Nozzle Seat


  • High capacity air discharge during pipeline filling
  • High volume air intake for vacuum break purposes, both during draining of water pipelines and/or column separations
  • Independent third-party tested
  • Controlled pressurized air discharge releases air when pipelines are fully-charged
  • Surge relief prevents pipeline bursts during pump trip & rapid pipeline filling
  • NSF61 approved