Two-stage automatic changeover propane regulator kit for dual-cylinder RV systems, with two 12" pigtail hoses included.
The Flame King KT12ACR6 is a two-stage automatic changeover LP propane regulator kit for RVs, trailers, and other approved dual-cylinder propane systems. It allows two propane tanks to be connected at once and automatically switches from the primary tank to the reserve tank when the primary tank runs empty.
This kit includes the automatic changeover regulator and two 12" pigtail hoses, making it a convenient replacement for compatible dual-tank RV propane setups. The indicator changes color when a tank has been depleted and needs to be refilled.
Automatically switches from primary to reserve cylinder when the first tank is empty
High-capacity regulator for compatible RV propane systems
Includes two 12" pigtail hoses for dual-cylinder connection
Color-changing indicator helps show when a cylinder needs refilled
The regulator inlets are 1/4" SAE inverted flare, and the outlet is 3/8" NPT female pipe thread. Verify your RV’s propane outlet line, regulator mounting location, and cylinder spacing before ordering. Do not use NPT-style pigtails on the regulator inlet side.
Turn off both propane cylinders before installation. Mount the regulator in an approved upright position, connect the included 12" pigtails to the regulator inlets and propane cylinders, then connect the 3/8" NPT female outlet to the RV propane supply line using approved LP gas fittings. After installation, slowly open the cylinder valves and leak-test all connections before use.
Package Contents: • 1 Flame King two-stage automatic changeover propane regulator • 2 12" propane pigtail hoses NOT Included — May Also Need: • Propane cylinders • 48" supply hose or RV outlet hose • LP gas fittings or adapters for the outlet side • Mounting hardware not supplied by current packaging • Leak detection solution • Professional propane system installation or pressure testing This listing is for the regulator kit with two 12" pigtails only unless otherwise stated.
Confirm the RV uses a dual-cylinder propane setup, the included 12" pigtails are long enough, and the RV supply line can connect to the regulator’s 3/8" NPT female outlet. If the existing regulator uses different pigtail fittings, hose lengths, or outlet plumbing, additional parts may be required.
Propane is flammable. Turn off propane before installation, use only approved LP gas fittings and hoses, never use thread sealant on flare fittings, and leak-test all connections before use. If propane odor is detected, shut off propane if safe, ventilate the area, avoid ignition sources, and have the system inspected before use.