Back To Top
Vent-O-Mat series RGXII Air Release Air Valve

The original “Anti-Shock” & “Anti-Surge” air release and vacuum break valves for water, sewage, and effluent pipelines.
RGXII Air Release Air Valves


Size Range
2" (50mm) to 8" (200mm)
-40°F to 185°F
Max. Operating Pressure
Up to 145psi (10bar)
Min. Operating Pressure
Flange/End Connection
MNPT, Flanged ASME B-16.5
Flange Drilling
ANSI 150#
Body Material
Fusion Bonded Epoxy powder coated Ductile Iron or Stainless Steel 304L or 316L
Top Cover
Stainless Steel 304L
Float Material
High Density Polyethylene (solid)
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
  • More compact & shorter to accommodate existing installations and retrofits
  • Designed for low head sealing as well where line pressures are generally lower than normal