A direct tank-to-regulator connection built specifically for RV dual-tank setups. The integrated back check valve prevents dangerous backflow from the regulator side when you swap or disconnect a tank, keeping your system safe during changeovers.
The MB Sturgis 100575-20-MBS is a 20-inch flexible propane pigtail hose designed to connect a standard DOT propane cylinder to a two-stage or automatic changeover regulator. One end uses a Type 1 (ACME) connection that threads directly onto standard RV propane tanks -- no extra adapters needed. The regulator end uses a 1/4" male inverted flare fitting, the standard thread found on most RV two-stage regulators and changeover manifolds.
The built-in back check valve at the tank end is what sets this hose apart from a basic pigtail. When one tank runs empty and you disconnect it, the check valve automatically stops gas from flowing backward out of the regulator side, preventing waste and reducing the risk of an accidental release. This feature is especially useful in dual-tank automatic changeover systems where one side may remain pressurized while you service the other.
Threads onto all standard RV and DOT propane cylinders with a Type 1 (ACME) valve -- no adapter required.
Prevents hazardous backflow from the regulator when the tank is disconnected or runs empty.
Standard regulator-side fitting compatible with most RV two-stage regulators and automatic changeover valves.
Rated well above typical RV appliance loads -- adequate for full-timer rigs running furnace, range, water heater, and refrigerator simultaneously.
This hose is the correct choice when you need to replace a worn, kinked, or leaking pigtail on a dual-tank propane setup -- the most common configuration on travel trailers, fifth wheels, and Class A motorhomes. It is also the right pick when upgrading a single-tank system to a dual-tank automatic changeover arrangement, since the back check valve is required for safe dual-tank operation.
At 20 inches, the hose gives enough slack to connect a horizontally mounted tank to a regulator mounted on the A-frame tongue or in a propane compartment without stressing the fittings. If your existing pigtail is shorter and you are experiencing fitting stress or cracking near the connections, the 20-inch length is typically the correct upgrade.
In a dual-tank system, both tanks feed a single regulator through separate pigtails. Without a back check valve, disconnecting one tank while the system is pressurized allows gas to escape backward through the open port. The integrated back check valve in the 100575-20-MBS closes automatically when the tank is removed, isolating the regulator from that port and keeping the system sealed. This is not just a convenience feature -- it is a safety requirement in properly configured dual-tank RV systems.
Confirm your regulator uses a 1/4" female inverted flare inlet before ordering. Some older regulators use a 9/16" inverted flare or a POL inlet -- those are NOT compatible with this pigtail without an adapter. When in doubt, measure the inlet port diameter on your regulator or check the regulator's part number.