[Upgraded 2-Stage Auto Changeover LP Propane Gas Regulator]This Rv Propane Regulator allow you to hook up 2 Propane tanks and automatically switches from primary to reserve tank when primary is empty and vice . The indicator changes color to let you know when a tank has been depleted and needs to be refilled also remind you switching to the backup tank. For RVs with dual propane tanks allow removal of empty cylinder for non-stop refill without interrupting propane supply. [Specification & Material]RV Propane Regulator: Inlets are 1/4inch SAE Inverted Flare, Outlet is 3/8inchinch Female NPT, Primary Cylinder Capacity 210, 000 BTU/, Reserve Cylinder 130, 000 BTU/. [For RV//Travel Trailer]This 2-Stage Auto Changeover LP Propane Gas Regulator for RV, suitable for RV with dual propane tanks. These 18inchinch RV pigtail propane hoses with 2-stage propane regulator can connect dual 5-40 lb refillable propane tanks or LP gas tanks to your 's 1/4inch inverted male flare. Replace any existing automatic changeover regulator on your current RV, Travel Trailer, , maintains constant an continuous gas. Material: plastic+metal colour: As shown Package Contents: 1 x 2 Stage Auto Changeover RV Propane Regulator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.