748A Pressure Vacuum Vent

748A Pressure Vacuum Vent




Pressure vacuum vent designed for installation on top of the vent pipe of an above ground or underground storage tank. Poppets seal vapors in the tank when pressure is equalized. The vent allows the tank to breathe during filling and dispensing operations. This vent must be used in conjunction with an emergency vent. It is recommended that the opening pressure setting is set below that of the emergency vent so the normal vent operates first. Settings are approximate.

NOTE: Normal vents such as pressure vacuum and updraft vents for above ground storage tanks should be sized according to NFPA 30 (2012) 21.4.3.

Standard Features

  •  Vents outward and upward in compliance with NFPA 30
  •  Tri-polar mounting screws for mounting exhaust hood in any of three positions

Construction Details

  • Body, seats, and hood: Aluminum
  • Poppets: Brass
  • Screens: Stainless steel


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Additional information


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