Camco 59953 1/4" Male NPT x 1/4" Female Inverted Flare Propane Fitting -- Solid Brass with Check Valve

The Right Adapter for Mismatched Propane Connections

Many RV propane systems mix pigtail hoses terminated with inverted flare fittings and regulators or manifolds ported with NPT threads. Without the correct adapter, those two standards simply will not connect -- and improvised workarounds risk leaks. The Camco 59953 is machined specifically to mate a 1/4" inverted flare female end (the pigtail side) to a 1/4" male NPT thread (the regulator or manifold side), giving you a clean, code-compliant joint.

The fitting is machined from solid brass, which resists corrosion from LP gas odorants and outdoor moisture, and provides the structural integrity needed to withstand standard propane system pressures. The integrated check valve is a key safety feature: it permits flow only from the pigtail toward the regulator, helping prevent reverse flow if a line is disconnected under pressure.

Where This Fitting Is Typically Used

The 59953 is intended for use in propane systems where a regulator or manifold has a 1/4" female NPT port and the incoming pigtail hose is terminated with a 1/4" inverted flare (also written as 1/4" IFF or 1/4" SAE 45-deg flare on some fittings). Common applications include:

• Connecting a two-stage RV regulator to a braided pigtail hose at the tank end
• Adapting LP manifold inlets that use NPT ports to accept inverted flare pigtails
• Replacing a corroded or stripped OEM fitting in an existing propane run
• Building a custom propane plumbing run in a camper, trailer, or converted van

Thread Identification Guide

Getting thread type right before purchasing saves time and return shipping. Here is how to identify each end:

• 1/4" Male NPT (pipe thread): Tapered thread that tightens with a wrench. Found on regulator bodies, manifold inlets, and many T-fittings in LP systems. Requires thread sealant (pipe dope rated for LP gas or PTFE tape).
• 1/4" Female Inverted Flare: Straight internal thread with a 45-deg internal seat that grips the flared end of the pigtail. No thread sealant is used -- the metal-to-metal flare seat creates the seal. Common on braided propane pigtail hoses.

Installation Tips

• Hand-tighten the NPT end first, then snug with a wrench -- typically 2 to 3 turns past hand-tight for 1/4" NPT brass into a brass body.
• Connect the pigtail's inverted flare nut to the female flare end of the fitting finger-tight, then tighten with a wrench -- do not over-torque, as over-tightening can damage the flare seat.
• After installation, perform a leak check using an approved LP leak detector solution. Do not use an open flame to check for leaks.
• Inspect the fitting annually for signs of corrosion, cracking, or odorant staining that may indicate a slow seep.

Fitting Identification

Thread Specifications

Physical Specifications

Application and Compatibility

Warranty