OPW EVR Certified Pressure Vacuum Vent - 2 in. NPT

2 in. NPT - 2.5 in. to 6 in. WC Pressure
ID Label Color:
1.50 LBS
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Pressure Vacuum Vents are installed on the top of vent pipes from underground or aboveground fuel storage tanks.  The vent cap and internal wire screen are designed to protect the tank vent lines against intrusion and blockage from water, debris or insects.  A normally closed poppet in the valve opens at a predetermined pressure or vacuum setting to allow the tank to vent.


  • Pressure/Vacuum Setting - 3 water column pressure settings and 8" water column vacuum settings are  factory preset and tested.
  • Reliable Service - Cycle tested to the equivalent of 80 years of service in the most severe environment without leakage problems.
  • Corrosion-Resistant Construction - A Duratuff ® composite body assures a long service life.
  • Easy installation - The 623V is available in 2" and 3" threaded versions.
  • California Air Resource Board-Certified
  • EVR-Certified
  • Underwriters Laboratory Listed
  • Complies with NFPA 30 Requirements - for venting gasoline vapors upward.
  • High Maximum Flow Rate - 6450 SCFH at 2 psi pressure drop.
  • Maninfold Vent Pipes - Vent pipes may be manifolded to produce a single Pressure Vacuum Vent line. The 623V exceeds California's requirements of a maximum vapor leak rate of 0.17 SCFH at 2.00 inches of H2O.
  • Leak Rate - Multiple pressure vacuum vents may be installed on a single site. The 623V exceeds California standards with a leak rate of 0.05 SCFH or less at 2.00 inches H2O.
  • Maintenance - No tools required. A removable snap fit top allows for easy maintenance (recommended yearly).
  • 100-mesh Stainless Steel Wire Screens - Helps prevent debris and insects from entering the tank vent lines. An added screen installed at the base prevents debris from intruding from the vent stack.
  • Adaptor Bushing - Removable Hex threaded bushing designed for easy installation on NPT threaded risers. Allows for easy access to lower screen.
    Patent No. WO2004/036096AZ


Top/Body:  polypropylene

Base:  anodized aluminum

Poppet:  anodized aluminum

Screen:  stainless steel mesh

Gasket: closed cell foam