3/8 inch Brass AutoFlare Gas Coupling

3/8 Inch Brass AutoFlare Gas Coupling – CSST Connection Fitting

This 3/8 inch brass AutoFlare coupling is designed for use with corrugated stainless steel tubing (CSST) in fuel gas systems. It provides a secure, metal-to-metal, self-flaring connection between CSST and standard NPT-threaded gas system components. The fitting is suitable for both residential and commercial gas distribution applications, including natural gas and propane systems.

Specifications

• Size: 3/8 inch nominal CSST
• Connection: AutoFlare x Male NPT
• Material: Lead-free brass (compliant with ANSI/NSF 372)
• Sealing Method: Metal-to-metal flare seal – no gaskets or rubber O-rings
• Max Operating Pressure: As defined by manufacturer for use in ANSI LC 1-compliant CSST systems

Application and Compatibility

• ✅ System Type: Fuel gas (natural gas and propane)
• ✅ Use: Connection between CSST and black iron pipe, shut-off valves, manifolds, or appliances
• ✅ Standards: Complies with ANSI LC 1 / CSA 6.26 for CSST installations
• ✅ Installation Location: Indoor use only; follow manufacturer guidelines for protection and support

Installation Notes

Ensure CSST ends are cut cleanly using an approved cutting tool and properly deburred. Use only manufacturer-approved AutoFlare insert tools to form the internal flare. Tighten to torque specifications using appropriate wrenches on flats. Do not over-tighten. Confirm system leak integrity through pressure testing in accordance with local code and manufacturer instructions.

Use Case Examples

• Transition from CSST gas tubing to NPT appliance inlets
• Connecting gas manifolds in residential systems
• Adapting CSST to rigid black iron or steel piping near meters or regulators

Material Performance

Brass construction offers mechanical strength, corrosion resistance, and dimensional stability across a broad range of operating temperatures. AutoFlare fittings provide a sealed joint without the need for elastomeric components, making them suitable for high-integrity gas systems.