A heavy-duty, UL- and CGA-approved LP propane hose built specifically for RV and liquid propane gas applications. The MER613-48 delivers reliable, flexible gas routing with fully crimped brass ferrules on both ends, thermal protection, and a 350 PSI working pressure rating -- giving you peace of mind whether you are parked at a campsite or living full-time on the road.
The Marshall Excelsior MER613-48 is a go-to replacement or extension hose for RV propane systems. Its 48-inch length provides enough flexibility to reach regulators, appliances, and external LP connections without straining fittings or routing hoses under tension. Both ends use 3/8" female flare swivel connections -- a standard thread used throughout the RV propane industry -- making this hose compatible with the vast majority of regulators, T-fittings, and appliance inlets found on travel trailers, fifth wheels, motorhomes, and toy haulers.
The thermoplastic hose body resists cracking, kinking, and UV degradation better than rubber alternatives, and the included thermal protection sleeve guards against heat-related damage near appliances or engine compartments. Every hose is finished with fully crimped brass ferrules that create a gas-tight, pull-tested mechanical seal -- no clamps, no worry about ferrules working loose over time.
Rated for 350 PSI working pressure with a 400 lb pull-test rating on the crimped ferrule ends -- built well beyond normal LP system operating pressures.
Meets Underwriters Laboratories and Compressed Gas Association standards for LP gas service -- a requirement for code-compliant RV propane installations.
Both ends are factory-crimped with solid brass ferrules. No clamps or field assembly needed -- the crimp creates a permanent, leak-free mechanical bond.
Manufactured by Marshall Excelsior, a Michigan-based LP gas equipment company with decades of experience building regulators, hoses, and fittings for the RV and propane industry.
Both ends of this hose feature swivel flare fittings, meaning the fitting body rotates independently of the hose during installation. This eliminates the common problem of hose twist during tightening -- a frequent source of stress cracks and micro-leaks in non-swivel designs. You can hand-tighten onto both the supply and receiving ports, then snug with a wrench, without fighting hose torque.
The 3/8" female flare (SAE 45-deg flare) is the industry-standard connection for LP gas hoses in the RV market. It mates directly with standard male flare fittings on two-stage regulators, POL adapters with flare outlets, T-fittings, and most appliance shutoff valves. No adapters are required for standard RV propane hookups.
Marshall Excelsior Company, based in Marshall, Michigan, has been manufacturing LP gas equipment since 1942. Their hoses, regulators, and fittings are widely specified by RV OEMs and are a trusted choice for service techs performing warranty and aftermarket propane system repairs. The MER613 series hoses carry a limited 5-year manufacturer warranty.