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I <br />features <br />• Pressure/Vacuum Setting - 3" water column pressure settings and 8" water column vacuum settings are <br />factory preset and tested. <br />• Reliable Service - Cycle tested to the equivalent of 80 years of service into the most severe environment <br />without leakage problems. <br />• Corrosion Resistant Construction - A Duratuff0 composite body assures a long service life. <br />• Easy installation - The 623V is available in 2" and 3" threaded versions. <br />• California Air Resource Board Certified <br />• EVR-Certified <br />• Underwriters Laboratory Listed <br />• Complies with NFPA 30 Requirements <br />• High Maximum Flow rate - 6450 SCFH at @ psi pressure drop[. <br />• Maninfold Vent Pipes - Vent pipes may be manifolded to produce a single Pressure Vacuum Vent <br />line. The 623V exceeds California's requirements of a maximum vapor leak rate of 0.17 SCFH at 2.00 <br />inches of HZO. <br />• Leak Rate - Multiple pressure vacuum vents installed on a single site. The 623V exceeds California <br />standards with a leak rate of 0.05 SCFH or less at 2.00 inches HZO. <br />• Maintenance - No tools required. A removable snap fit top allows for easy maintenance (recommended <br />yearly) <br />• 100 -mesh Stainless Steel Wire Screens - Helps prevent debris and insects from entering the tank vent <br />lines. An added screen installed at the base prevents debris from intruding from the vent stack <br />• Adaptor Bushing - Removable Hex threaded bushing designed for easy installation on NPT threaded <br />risers. Allows for easy access to lower screen. <br />