Connects a propane tank to your RV's regulator. RV Type 1 (ACME) connector with built-in back check valve prevents hazardous backflow — suitable for dual-tank setups. 1/4" male inverted flare regulator-side fitting. 20" length. Rated up to 450,000 BTU/hr.
A propane pigtail is the connection between your RV's propane tank and its regulator — and the MB Sturgis 100575-20-MBS is built around the RV Type 1 (ACME) connector, the modern standard fitting found on most current propane cylinders. This 20" pigtail features a built-in back check valve, which prevents hazardous backflow leakage and makes it suitable for dual-tank setups where two pigtails feed a shared two-stage regulator.
The Type 1 connector provides a higher rate of flow than older POL-style connections, which reduces the chance of the system going into bypass mode and shutting down gas supply during normal use. If flow demand does exceed the connector's 450,000 BTU/hr capacity, an internal ball valve responds by pressing against a spring to shut off flow as a safety measure, rather than allowing an unsafe condition to develop. The opposite end terminates in a 1/4" male inverted flare fitting, designed to thread into the female inverted flare inlet found on most RV propane regulators. Built from durable thermoplastic hose material, the 100575-20-MBS is designed to handle the temperature swings and outdoor conditions typical of RV use.
Prevents hazardous backflow leakage — makes this pigtail suitable for dual-tank propane systems with a shared regulator
Modern standard tank connector provides higher flow rate than older POL fittings, reducing the chance of bypass shutdown
Internal ball-and-spring mechanism shuts off flow if demand exceeds rated capacity, protecting against unsafe overflow conditions
Mid-range pigtail length for standard tank-to-regulator routing distances on most travel trailers and fifth wheels
Propane pigtails are matched to specific tank and regulator fitting types. Before ordering, confirm: 1. Tank-side connector — Type 1 (ACME) vs. POL: This pigtail uses the modern RV Type 1 (ACME) connector, standard on most current propane tanks. If your tank uses the older POL left-hand-thread connection, you will need a different pigtail or an adapter — this part will not thread onto a POL valve. 2. Regulator-side fitting: The regulator end of this pigtail is a 1/4" male inverted flare. Confirm your regulator has a matching 1/4" female inverted flare inlet. Some regulators use 1/4" male NPT instead — verify before ordering. 3. Length: This pigtail is 20" long. MB Sturgis offers the 100575 family in multiple lengths (12", 15", 20", 24", 30", 36") — confirm 20" matches your tank-to-regulator routing distance. 4. Dual-tank setups: If you have two tanks feeding a single two-stage regulator, you will need two pigtails — one per tank.
The 100575 Propane Pigtail with Back Check is available in multiple standard lengths, all sharing the same RV Type 1 x 1/4" male inverted flare connector configuration: • 100575-12-MBS — 12" (1 ft) • 100575-15-MBS — 15" • 100575-20-MBS (This Product) — 20" • 100575-24-MBS — 24" (2 ft) • 100575-30-MBS — 30" • 100575-36-MBS — 36" (3 ft) Select the length that best matches the physical distance between your tank(s) and regulator. If your regulator instead requires a 1/4" male NPT connection, see the MB Sturgis 100473 series.
Installation Steps: 1. Shut Off Gas Supply: Close the tank valve completely before disconnecting any existing pigtail or making new connections 2. Connect the Type 1 End: Thread the RV Type 1 (ACME) connector onto the propane tank valve and hand-tighten 3. Connect the Inverted Flare End: Thread the 1/4" male inverted flare fitting into the regulator's matching female inlet 4. Tighten Securely: Tighten both connections to a secure, leak-free fit without overtightening 5. For Dual-Tank Setups: Repeat installation for the second tank and pigtail, connecting both to the two-stage regulator's separate inlets 6. Leak Test: Slowly open the tank valve(s) and perform a soap-and-water leak test on every connection before use Gas line work should be performed or verified by a qualified technician. Always leak-test connections before placing the system into service.
In The Package: • (1) 100575-20-MBS Propane Pigtail — 20" Length • RV Type 1 (ACME) Connector with Built-In Back Check Valve • 1/4" Male Inverted Flare Fitting NOT Included: • Second pigtail (required for dual-tank setups — purchase separately) • Regulator • Thread sealant
MB Sturgis Technical Support: Phone: (314) 291-6665 Email: [email protected] MB Sturgis Inc. has supplied OEMs, distributors, gas installers, and end users with safe LP and natural gas connection products since 1959.