Cavagna Two-Stage Regulator with Excess Flow POL Inlet Horizontal Vent. A combination regulator; first stage reduces cylinder outlet pressure to 10 psi, and the second stage maintains a stable working pressure of 11 inch water column. Inlet: Excess Flow POL, Outlet: 3/8 inch Female Pipe Thread, horizontal vent, 160000 BTU/hr. For use on RVs with single vertical tank and horizontal tank. Safety features: Excess Flow Device: Ensures protection with all hose connections. Limits gas flow in the event of hose rupture or accidental disconnection. Overpressure Protection Device: Limits environmental propane release in case of regulator malfunction to a value less than 2 psi, significantly lower than that mandated by UL standard 144. Boxed.