1 inch Carbon Steel 401G Gas Press Coupling with Stop Press x Press

1" Carbon Steel Gas Press Coupling with Stop – Press-Fit Fitting for Fuel Gas Systems

The 1" carbon steel press coupling with internal stop is designed for use in fuel gas and low-pressure steam systems. Manufactured in accordance with industry specifications, this fitting is suitable for joining carbon steel pipe in non-potable applications using a mechanical press system. It provides a reliable, flame-free alternative to traditional welded or threaded joints, minimizing installation time while maintaining code compliance.

This coupling features a built-in pipe stop for controlled pipe insertion depth and is compatible with press tools approved for carbon steel fittings. It includes a factory-installed sealing element rated for gas service, and is engineered to provide a permanent mechanical connection under normal operating pressures and temperatures for gas piping systems.

Product Specifications

• Material: ASTM A135/A795 carbon steel
• Connection Type: Press x Press with pipe stop
• Sealing Element: Yellow HNBR (hydrogenated nitrile butadiene rubber), rated for fuel gas
• Nominal Size: 1 inch
• Working Pressure: Up to 125 psi (gas applications, depending on code jurisdiction)
• Temperature Rating: -40°F to 180°F (with HNBR seal)
• Certifications: cULus Listed to ANSI LC-4 / CSA 6.32 for fuel gas; IAPMO/UPC listed; compliant with NFPA 54 and IFGC

Approved Applications

• Natural gas and propane distribution piping
• Low-pressure fuel gas systems in commercial and residential buildings
• Dry compressed air systems (non-potable)
• Vacuum lines and inert gas distribution (where permitted)

Installation Guidelines

Fitting installation requires an approved press tool equipped with manufacturer-compatible jaws sized for 1" carbon steel pipe. Ensure pipe is cut square, deburred, and marked for insertion depth. Use appropriate press checks to verify connection integrity post-installation. No open flame, threading, or welding is required, reducing jobsite hazards and permitting faster installation in confined spaces.

System Design Considerations

This press coupling should only be used with carbon steel pipe intended for press connections. Do not use with potable water systems. Verify that system design, pressure ratings, and pipe compatibility meet local plumbing and mechanical code requirements before installation.

Summary

The 1" carbon steel gas press coupling with stop offers a code-compliant, mechanically secure connection for fuel gas systems. Its press-fit design streamlines assembly while maintaining robust sealing performance, making it a preferred solution for professionals working in time-sensitive or retrofit gas line applications.