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. 48" (4 ft) 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 100575-48-MBS is built around the RV Type 1 (ACME) connector, the modern standard fitting found on most current propane cylinders. This 48" (4 ft) 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. 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. At 48" (4 feet), this length is well suited for trailers with greater spacing between the tank compartment and regulator, or for installations that benefit from a longer pigtail with a gentle loop rather than a taut straight run. Built from durable thermoplastic hose material, the 100575-48-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
Longer pigtail suited for greater tank-to-regulator spacing or installations that benefit from a relaxed routing loop
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 48" long. The 100575 family is available in lengths from 12" to 60" — verify 48" is the right fit for your tank-to-regulator 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 — 20" • 100575-24-MBS — 24" (2 ft) • 100575-30-MBS — 30" • 100575-36-MBS — 36" (3 ft) • 100575-48-MBS (This Product) — 48" (4 ft) • 100575-60-MBS — 60" (5 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. Route Excess Hose Neatly: At 48", route any slack in a gentle loop away from heat sources, moving parts, and sharp edges 5. Tighten Securely: Tighten both connections to a secure, leak-free fit without overtightening 6. For Dual-Tank Setups: Repeat installation for the second tank and pigtail, connecting both to the two-stage regulator's separate inlets 7. 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) 100575-48-MBS Propane Pigtail — 48" 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.