Marshall MEGR253 LP Dual-Stage Auto-Changeover Propane RegulatorMarshall Excelsior’s dual-stage auto-changeover propane regulator is for RVs with dual propane tank hookups. It combines both a high pressure first stage and a low pressure second stage regulator into a single unit. Ideally designed for RV applications, these regulators ensure a smooth and continuous flow of gas to all appliances. Its inlets are 1/4″ FPT and the outlet is a 3/8″ FPT.Auto-Changeover: Connect two propane tanks to the regulatorLow Pressure: Outlet pressure is 11″W.C. (0.5 PSI)Dual Stage: Has integral first and second stages that ensure smoother, more consistent flowRV Low PressureRV appliances require low pressure propane (11″W.C./0.5 PSI) for efficient operation. This regulator has two-stages to achieve low pressure. The first-stage reduces the tank pressure to about 10 PSI. The second-stage reduces the 10 PSI to 11″W.C. (0.5 PSI)Automatic ChangeoverAn automatic changeover