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Marshall Excelsior MECMER425-15 RV LP Gas Pigtail Hose 15-Inch Female QCC Type 1 x 1/4-Inch Male Inverted Flare

Marshall Excelsior MECMER425-15 15-inch RV LP gas pigtail hose with female QCC Type 1 connector and 1/4-inch male inverted flare fitting
15" RV Pigtail - Female QCC Type 1 Connection x 1/4 Inch Male Inverted Flare
 
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Part Number: MER425-15
Manufacturer: Marshall Excelsior

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Marshall Excelsior 350 PSIG Rated Made in USA Marshall Excelsior MECMER425-15 -- 15" RV LP Gas Pigtail, QCC Type 1 x 1/4" Male Inverted Flare

A reliable, code-compliant LP pigtail hose built for RV propane systems. This 15-inch hose connects a QCC Type 1 (Acme-style) tank fitting directly to a 1/4-inch male inverted flare regulator or manifold inlet -- the standard interface on most RV dual-stage and automatic changeover regulators. Rated to 350 PSIG working pressure and UL/CGA approved, it handles the demands of full-time RV use, boondocking, and seasonal camping.

High-Flow LP Pigtail Built for RV Propane Systems

The MECMER425-15 is manufactured by Marshall Excelsior, a U.S. propane component specialist whose pigtail hoses are widely used in RV OEM and aftermarket applications. The hose features a flexible thermoplastic construction with fully crimped brass ferrules on both ends -- no field-assembled fittings that can work loose over time.

At 15 inches, this is the standard pigtail length for connecting a 20 lb. or 30 lb. DOT cylinder to a side-by-side dual-bottle regulator bracket. It provides enough slack to allow cylinder removal and reinstallation without straining the regulator connection.

High-Flow QCC Connector

Rated 200,000 BTU/hr with 100 SCFH flow capacity. Supports full RV appliance loads including furnace, range, water heater, and generator simultaneously.

350 PSIG Working Pressure

Built well beyond normal LP system operating pressures for a wide safety margin. Pairs with a 400 lb. pull test rating on the crimped brass ferrules.

Thermal Protection

Integrated thermal protection sleeve guards the hose from engine compartment and generator heat -- important for motorhomes and rigs with exposed propane runs.

UL Listed and CGA Approved

Meets UL 21 and CGA standards for LP gas hose. Compliant for use in RV propane systems and accepted by most campground and safety inspections.

Fitting Identification and Thread Compatibility

Getting the fittings right is critical on LP connections. This hose uses two distinct ends:

  • Female QCC Type 1 (also called QCC-1 or Acme connector): This is the large hand-tightened nut that threads onto the standard POL/QCC valve found on all modern 20 lb. and 30 lb. propane cylinders sold in North America after 1998. It is a left-hand thread and requires no tools -- hand-tight is correct.
  • 1/4-inch Male Inverted Flare (also called 1/4" MIF or SAE 45-degree inverted flare): This end threads into the inlet port of your LP regulator, automatic changeover valve, or T-fitting. This is the standard thread used on Marshall Excelsior, Cavagna, Rego, and most OEM RV regulators.

Confirm your regulator inlet accepts a 1/4-inch male inverted flare before ordering. Some regulators use a 3/8-inch inverted flare inlet -- those require the MECMER430 series instead.

Fully Crimped Brass Ferrules: Both ends are factory-crimped -- not compression-style field fittings. Crimped ferrules eliminate the risk of fitting loosening from vibration on the road, which is a real failure mode with compression-assembled hoses on towed RVs.

Typical RV Applications

  • Connecting dual 20 lb. or 30 lb. DOT cylinders to an automatic changeover regulator on a travel trailer or fifth wheel
  • Single-cylinder 20 lb. or 30 lb. bottle connections on smaller trailers, pop-ups, and camper vans
  • Replacement pigtail on dual-stage regulator assemblies when original hose shows cracking, kinking, or corrosion at the ferrule
  • Service replacement on motorhome external cylinder compartments
Replacement Interval Note: The RV Industry Association and most LP service technicians recommend replacing propane pigtail hoses every 5-7 years, or immediately if the hose shows any cracking, abrasion through the outer jacket, kinking, or discoloration near the ferrules. The MECMER425-15 is a direct OEM-spec replacement for many factory-installed pigtails.

Installation Tips

  • Always use a fresh, compatible thread sealant rated for LP gas (such as Rectorseal or yellow PTFE tape) on the 1/4" male inverted flare threads before installation. Do not use standard white plumber's tape.
  • Tighten the inverted flare end with a wrench (do not over-tighten -- snug plus 1/4 turn after hand-tight is typical for brass flare fittings).
  • The QCC Type 1 nut is hand-tight only -- left-hand thread, turn clockwise to loosen, counterclockwise to tighten.
  • After connection, perform a leak test with soapy water or an LP-rated leak detector solution at all joints before relighting appliances.
  • Route the hose to avoid sharp bends, contact with exhaust components, and areas where it could be pinched by doors or storage compartment lids.
Often Purchased Together: RV owners replacing a single pigtail typically replace both hoses at the same time on dual-bottle setups. Consider picking up a second MECMER425-15 for a matched pair, or pair with a Marshall Excelsior automatic changeover regulator for a complete system refresh.

Product Specifications

ManufacturerMarshall Excelsior Company
Vendor Part NumberMECMER425-15
SKU06-0280
UPC815505010672
Country of OriginMade in USA

Hose Dimensions

Overall Length15 inches
Hose Inner Diameter1/4 inch
Hose ConstructionFlexible thermoplastic with thermal protection sleeve
Ferrule TypeFully crimped brass, both ends

Pressure and Flow Ratings

Working Pressure350 PSIG maximum
Pull Test Rating400 lbs. (crimped ferrule)
Flow Capacity100 SCFH (standard cubic feet per hour)
BTU Capacity200,000 BTU/hr (high-flow)

Fitting Details

Inlet Fitting (tank side)Female QCC Type 1 (Acme, left-hand thread)
Outlet Fitting (regulator side)1/4-inch Male Inverted Flare (SAE)
QCC Nut MaterialBrass
Compatible Tank ValvesStandard QCC-1 valves on 20 lb. and 30 lb. DOT propane cylinders

Approvals and Compliance

UL ListedYes (UL 21 LP gas hose standard)
CGA ApprovedYes (Compressed Gas Association)
Thermal ProtectionYes -- included
Intended UseRV LP gas propane systems

What Is Included

In the Box1x MECMER425-15 pigtail hose assembly
Regulator IncludedNo -- hose only
Fittings IncludedBoth end fittings are factory-installed and crimped
Important Safety Information
  • This hose is rated for LP (propane) gas service only. Do not use with natural gas, compressed air, or any fluid other than propane.
  • Maximum working pressure is 350 PSIG. Do not install in systems that may exceed this rating.
  • Always perform a leak test with soapy water or an LP-rated leak detection solution after installation. Never use an open flame to check for leaks.
  • Replace immediately if the hose shows any visible cracking, kinking, abrasion through the outer jacket, or corrosion at the ferrules.
  • The QCC Type 1 fitting is for use with modern QCC-1 cylinder valves only. It is not compatible with older POL (left-hand external thread) fittings without a separate adapter.
  • Do not use standard white plumber's PTFE tape on LP fittings -- use only yellow PTFE tape or a thread sealant rated for propane service.
  • Installation and service of LP gas components should comply with NFPA 58 and any applicable local codes. If you are unsure of your system configuration, consult a qualified LP gas technician.


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