3/4 inch Brass AutoFlare Gas Adapter with Steel Mount Flange Flange x Male

3/4 Inch Brass AutoFlare Gas Adapter – Engineered for Secure CSST Connections

The 3/4 inch Brass AutoFlare Gas Adapter is a precision-machined transition fitting designed to connect corrugated stainless steel tubing (CSST) to standard female NPT threads in gas distribution systems. This adapter enables safe, durable, and code-compliant connections in residential and commercial fuel gas applications using AutoFlare® technology.

Technical Features and Construction

Constructed from lead-free brass, this fitting provides long-term resistance to corrosion and stress fatigue common in gas service environments. The AutoFlare end securely grips the CSST with a metal-to-metal seal, while the NPT end connects to rigid pipe or gas appliance fittings.

• ✅ Material: Lead-free brass per ASTM B16 / NSF/ANSI 372
• ✅ Connection Type: AutoFlare inlet x 3/4 inch FNPT outlet
• ✅ Seal Mechanism: Flare compression; no additional sealant on flare required
• ✅ Working Pressure: Suitable for gas systems up to 5 psi
• ✅ Temperature Range: -40°F to 150°F (CSST-dependent)

Installation Considerations

This fitting must be installed in accordance with the CSST manufacturer’s instructions. Ensure square-cut tubing, correct use of AutoFlare bushings, and proper tightening torque to achieve a gas-tight seal. Use thread sealant on the FNPT side only; do not use sealant or tape on the flare surface. Pressure testing is required per fuel gas code after installation.

Typical Applications

Used in branch and termination connections for CSST systems, including:

• Gas appliance hookups (e.g., furnaces, water heaters, cooktops)
• Transitions to black iron or copper piping
• Terminations at gas valves or manifold headers

Compliance and Standards

• ✅ Certified: CSA-certified for use with CSST gas piping systems
• ✅ Code Compliance: ANSI Z223.1 / NFPA 54, IRC, and UPC-compliant when installed per listing

Did You Know?

AutoFlare connections offer mechanical gas sealing without relying on elastomeric gaskets, improving long-term joint integrity under thermal cycling and vibration.

The 3/4 inch Brass AutoFlare Gas Adapter provides a trusted transition solution for CSST systems, combining robust materials with precision fit for demanding gas service installations.