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Marshall Excelsior MECMER407-144 Soft Nose POL x 1"-20 Male Swivel Propane Adapter Hose 144 Inch

Marshall Excelsior MECMER407-144 Soft Nose POL x 1"-20 Male Swivel propane adapter hose, 144 inches long, with crimped brass ferrules and thermal protection
Marshall Excelsior Soft Nose POL x 1"-20 Male Swivel Propane Adapter Hose - 144"
 
List Price: $72.77
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Part Number: MER407-144
Manufacturer: Marshall Excelsior

Quantity in Stock :20

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Marshall Excelsior 350 PSIG Rated Made in USA MECMER407-144 Soft Nose POL x 1"-20 Male Swivel Propane Adapter Hose -- 144 Inches

A full 12 feet of flexible, UL- and CGA-approved propane hose built for RV LP gas systems. The Soft Nose POL inlet threads directly onto standard propane cylinders without a wrench, while the 1"-20 Male Swivel outlet connects to standard RV regulator and appliance fittings. Rated to 350 PSIG working pressure and backed by a limited 5-year manufacturer warranty from a company that has been making LP gas equipment in the USA since 1932.

12 Feet of Reach for RV, Camping, and LP Gas Applications

The 144-inch length gives you real flexibility when connecting a portable propane cylinder to an RV regulator, outdoor appliance, generator, or propane distribution system. Whether you are extending the reach from a remote cylinder bank or simply need a longer hose to route around an obstacle, the MECMER407-144 covers it without requiring additional fittings or adapters in the line.

The hose body is a flexible thermoplastic construction -- not rubber -- which resists cracking and UV degradation better than older rubber hoses in outdoor and under-rig environments. Crimped brass ferrules on both ends create a leak-resistant, permanent connection between the hose and the brass fittings. Thermal protection is built in along the hose body.

Soft Nose POL Inlet

Left-hand thread POL fitting with integrated O-ring and plastic handwheel. No wrench needed for connection to standard propane cylinders.

1"-20 Male Swivel Outlet

Standard 1"-20 UNF male swivel fitting connects to RV regulators, quick-connects, and most LP appliance inlets without adapters.

UL and CGA Approved

Hose and fittings meet UL and CGA standards for LP gas service, making it acceptable for use in code-compliant RV and outdoor installations.

Crimped Brass Ferrules

Both ends are fully crimped -- not clamped -- for a permanent, high-integrity seal rated to withstand a 400 lb. pull test.

Who Needs This Hose

This hose is the right choice when:

  • Your RV regulator is mounted away from the cylinder compartment and a standard short hose does not reach.
  • You are running a portable or auxiliary propane cylinder outside the rig and need a long, safe connection back to the regulator or appliance.
  • You want to replace an aging rubber hose with a newer thermoplastic hose before the next season.
  • You need a backup or spare hose that meets CGA standards for peace of mind on extended trips.
Made in the USA: Marshall Excelsior has manufactured LP gas equipment in Marshall, Michigan since 1932. The MECMER407-144 is assembled domestically to tight tolerances, and the 5-year limited warranty reflects that confidence in materials and workmanship.

Fitting Details and Compatibility

The Soft Nose POL end uses a left-hand internal thread (POL = Prest-O-Lite) that mates with the valve outlet on standard 20 lb., 30 lb., and 40 lb. propane cylinders commonly used in RV applications. The integrated O-ring provides the seal -- no Teflon tape required. The plastic handwheel allows hand-tight connection.

The 1"-20 Male Swivel outlet is the standard thread used on most RV two-stage regulators, Camco-style regulators, and many LP quick-connect systems. The swivel feature prevents the hose from twisting during connection, which reduces stress on the hose body and fitting over time.

Replacement Hose Note: This hose is a direct functional replacement for any Soft Nose POL x 1"-20 Male hose in the 12-foot class. If your existing hose shows surface cracking, discoloration, stiff sections, or is more than 5-7 years old, replacement before the next trip is good practice regardless of visible leaks.

Installation Tips

  • Always turn the cylinder valve off before disconnecting or connecting the hose.
  • The POL fitting threads left-hand (counter-clockwise to tighten onto the cylinder valve). The handwheel makes this hand-tight operation simple.
  • After connection, apply a soap-and-water solution to all fittings and check for bubbles before lighting any appliances.
  • Route the hose away from heat sources, sharp edges, and moving components. Avoid tight bends at the ferrule ends.
  • Store coiled loosely when not in use. Do not kink or crush the hose during storage.
Maintenance Tip: Inspect the hose body and fittings at the start of each camping season. Look for cuts, abrasion through the outer jacket, corrosion at the ferrules, or O-ring deterioration at the POL end. Replace the O-ring if it shows cracking or flattening -- spare POL O-rings are widely available at RV parts retailers.
Not for High-Pressure Vapor Service Beyond Rated PSI: This hose is rated for LP gas vapor/liquid service up to 350 PSIG. Do not use it in compressed air, oxygen, natural gas, or any service other than propane/LP gas.

Product Specifications

ManufacturerMarshall Excelsior
Vendor Part NumberMECMER407-144
SKU06-0249
UPC815505010184
Country of OriginMade in USA
WarrantyLimited 5-Year Manufacturer Warranty

Hose Dimensions and Weight

Hose Length144 inches (12 feet)
Hose Outer DiameterApproximately 1/4 inch
Weight1.38 lbs.

Pressure and Performance Ratings

Working Pressure350 PSIG maximum
Pull Test Rating400 lbs.
ServiceLP Gas (propane vapor/liquid)

Fitting Specifications

Inlet Fitting TypeSoft Nose POL (left-hand thread, O-ring seal)
Outlet Fitting Type1"-20 Male Swivel (right-hand thread)
Ferrule TypeFully crimped brass, both ends
HandwheelPlastic, on POL inlet end
O-RingIncluded on POL inlet end

Materials and Approvals

Hose Body MaterialFlexible thermoplastic
Thermal ProtectionIncluded (integral)
ApprovalsUL Listed, CGA Approved

What Is Included

Hose Assembly1x 144" propane adapter hose
POL O-RingInstalled on POL inlet fitting
HandwheelInstalled on POL inlet fitting
Important Information -- Read Before Use
  • This hose is rated for LP gas (propane) service only -- do not use with natural gas, compressed air, oxygen, or any other medium.
  • Maximum working pressure is 350 PSIG. Do not exceed this rating under any circumstances.
  • The POL fitting uses a left-hand thread. Tighten by turning counter-clockwise (when facing the cylinder valve). The O-ring provides the seal -- do not use thread sealant tape on the POL end.
  • Always perform a leak test with soapy water after every connection before opening the cylinder valve fully or operating any appliance.
  • Inspect the hose before each use. A hose with cuts, abrasions, kinks, or visible ferrule corrosion must be replaced immediately.
  • Keep the hose away from open flame, hot surfaces, sharp edges, and moving parts during use and storage.
  • Do not use this hose to connect cylinders that are not in an upright, secure position.
  • This product is not intended for permanent buried or concealed installation.


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