The Suburban Two-Stage Vertical Vent Propane Regulator is a combination regulator that controls the flow of gas to all RV appliances. The first stage reduces the cylinder outlet pressure to 10 psi, and the second stage maintains a stable working pressure of 11" water column. For use on RVs with single horizontal or vertical tank. Kit includes the plastic vent covers required by RVIA. SAFETY FEATURESExcess Flow Device â Ensures protection with all hose connections. Limits gas flow in the event of hose rupture or accidental disconnection. Overpressure Protection Device â A feature that operates to shut off the flow of gas in case of regulator malfunction when the regulator outlet pressure reaches the limits. This limits environmental propane release to a value less than 2 psi, significantly lower than that mandated by UL standard 144. Such a feature shall remain closed until it has been manually reset.• A combination regulator• First stage reduces cylinder outlet pressure to 10 psi• Second stage maintains a stable working pressure of 11" water column• Inlet: 1/4" female pipe thread• Outlet: 3/8" female pipe thread• Vertical vent• 160, 000 BTU/hour• Kit includes the plastic vent covers required by RVIA• UL listed• Dimensions: 8.25" x 4.938" x 3.875" Second stage maintains a stable working pressure of 11"" water column For use on RVs with single horizontal or vertical tank Includes plastic vent covers required by RVIA | Suburban Two-Stage Regulator Kit, Vertical Vent