The Marshall Excelsior MER613-144 gives you a full 144 inches (12 feet) of flexible, high-pressure-rated propane hose with 3/8" female flare swivel connections on both ends. Built to UL and CGA standards and manufactured in the USA, this hose is a trusted solution for RV liquid propane gas systems that need reach, flexibility, and reliable performance under pressure.
When your RV propane system needs a longer run -- between a tank and a regulator, between a generator and a supply point, or as part of a multi-tank manifold setup -- the MER613-144 delivers without compromise. At 144 inches, it offers significantly more working length than standard short-run hoses, reducing strain on fittings and allowing tanks or appliances to be positioned where they make sense rather than where the hose forces them.
Both ends feature 3/8" female flare swivel connections with fully crimped brass ferrules, meaning no threading into fixed positions -- the swivel design lets each end rotate freely during installation so you can achieve a leak-free flare seat without twisting the hose body. The thermoplastic construction remains flexible even in cold weather, and the included thermal protection layer adds a critical safety margin in high-heat environments.
Rated for 350 PSI working pressure, well above the operating range of standard RV LP gas systems, which typically run at 11 inches water column (under 1 PSI) at the appliance and up to 250 PSI on the high-pressure tank side.
Each hose passes a 400-pound pull test, verifying that the crimped brass ferrule connections at both ends can withstand physical stress without separating -- a critical safety assurance for hoses that may experience tension or movement in transit.
The thermoplastic hose body is independently listed by Underwriters Laboratories (UL) and approved by the Compressed Gas Association (CGA), meeting recognized safety standards for LP gas service in RV and portable applications.
3/8" female flare swivel fittings allow each end to rotate independently during makeup, eliminating hose twist and making it far easier to achieve a proper, leak-free flare seat connection on both sides simultaneously.
The 3/8" SAE female flare swivel fitting is the standard connection type used across a wide range of RV propane regulators, tanks, pigtails, and high-pressure appliance feeds. This hose connects directly to any male 3/8" SAE flare fitting -- common on two-stage regulators, manifold blocks, portable propane tanks with adapters, and many generator propane feeds.
The hose body is flexible thermoplastic -- not rubber -- which resists cracking, ozone degradation, and UV exposure better than older rubber-bodied LP hoses. Thermoplastic construction also means the hose stays pliable in temperatures well below freezing, which matters for winter campers and full-timers in cold climates.
Brass ferrules are crimped (not clamped) at the factory, creating a permanent, pressure-tested mechanical bond between the hose body and the fitting. Field-installed clamp connections are a known failure point in LP gas systems; the crimped construction on the MER613-144 eliminates that risk.
Backed by Marshall Excelsior's limited 5-year manufacturer warranty. Designed and manufactured in the USA by Marshall Excelsior Company, a Michigan-based manufacturer specializing in LP gas equipment and regulators since 1945.