3/4 inch Brass AutoFlare Gas Coupling

3/4 Inch Brass AutoFlare Gas Coupling – For Corrugated Stainless Steel Tubing (CSST) Systems

The 3/4 inch Brass AutoFlare Gas Coupling is a mechanical fitting used to join corrugated stainless steel tubing (CSST) to NPT-threaded components in low-pressure gas distribution systems. It provides a gas-tight seal without requiring flaring or soldering, simplifying installations while maintaining code compliance.

Application Overview

This coupling is engineered for use in natural gas and propane distribution lines in residential and commercial settings. Designed specifically for CSST systems, the AutoFlare connection method compresses the tubing into the internal flare seat, ensuring a secure and leak-resistant seal.

• ✅ AutoFlare Design Forms a metal-to-metal seal without gaskets or O-rings for permanent connections.
• ✅ Lead-Free Brass Conforms with ANSI/NSF 372 standards for lead content in potable systems, and is approved for gas use under applicable codes.
• ✅ Threaded Outlet Features standard 3/4 inch NPT male or female threads for direct connection to shutoff valves or appliance connectors.

Installation Guidelines

Installation requires only basic hand tools and a tube cutter. Follow manufacturer instructions for cutting CSST to length, preparing the ends, and threading the coupling. Always verify torque specifications and check for leaks using an approved gas leak detection method after pressurization.

• ✅ No Special Tools Required Installs without flaring tools or torches.
• ✅ Code Compliance Approved for use in ICC and NFPA-listed CSST systems.
• ✅ Sealing Requirements Use thread sealant approved for gas applications when connecting to NPT threads.

Technical Specifications

• Material: Lead-free brass
• Tube Compatibility: 3/4 inch CSST
• Connection Type: AutoFlare x NPT
• Certifications: CSA listed; complies with ANSI LC 1 and ASTM F1973 standards

Typical Use Cases

This coupling is commonly used to connect CSST to gas meters, shutoff valves, and appliance inlets such as water heaters, boilers, cooktops, or furnaces. It is suitable for new installations, retrofits, or line extensions within approved gas piping systems.

Material Advantages

Brass provides inherent resistance to corrosion and stress cracking in gas environments. Its mechanical integrity makes it a preferred material in flared and compression connections used in low-pressure gas piping networks.

The 3/4 inch Brass AutoFlare Gas Coupling is a field-proven solution for creating secure CSST-to-NPT transitions. It supports faster assembly while maintaining system safety and regulatory compliance.