A heavy-duty, flexible propane pigtail hose built for RV LP systems. The Marshall Excelsior MER401-48 connects a POL-style cylinder valve to a 1/4" male inverted flare appliance or regulator inlet, with a built-in excess flow feature and fully crimped brass ferrules for leak-resistant, long-service connections. Made in the USA and backed by a 5-year limited warranty.
Pigtail hoses are the critical flex link between your stationary LP cylinder and the hard-line or regulator on your RV. Unlike rigid copper tubing, a quality flex hose absorbs vibration, allows easy cylinder swaps, and routes around obstructions inside a propane compartment. The MER401-48 is a go-to replacement and upgrade hose trusted by RV technicians and DIY owners alike.
At 48 inches, this hose provides generous reach for dual-cylinder setups, allowing the active cylinder to sit comfortably while the standby cylinder remains connected. The excess flow valve at the POL end automatically restricts gas flow if downstream demand exceeds safe limits -- an important safety layer in any propane system.
Built-in excess flow mechanism restricts LP flow automatically if a hose ruptures or downstream demand spikes beyond safe levels.
Both ends are fully crimped with solid brass ferrules -- no clamps to loosen over time. Ferrules form a permanent, leak-resistant seal.
Hose includes thermal protection to help resist heat degradation in enclosed propane compartments exposed to engine bay or ambient heat.
Meets UL and CGA safety standards for LP gas service. Compliant with typical RV park and campground safety inspections.
Getting the fittings right is the most important step when selecting a pigtail hose. This hose uses two distinct connection types:
If your regulator uses a 3/8" or 1/2" inverted flare inlet, you will need a separate brass adapter -- that adapter is not included with this hose.
The hose body is flexible thermoplastic, rated for LP gas service. Thermoplastic construction resists cracking in cold-weather conditions -- important for full-timers and winter campers. The 1/4" inner diameter supports the flow rates typical of RV regulator and appliance pigtail duty.