Value Brand 1-1/4" Malleable Iron Union Class 300

1-1/4" Malleable Iron Union Class 300

This union connects two 1-1/4 inch FNPT pipe ends in high-pressure plumbing systems. It meets ASME B16.39 and ASTM A197 standards for malleable iron fittings. The Class 300 rating supports saturated steam up to 300 psi and non-shock pressure up to 600 psi at 150 degrees F. It is suited for installers needing a removable joint in demanding service.

Build integration: FNPT threads and pressure class

The female NPT threads accept matching male pipe threads without welding or soldering. Malleable iron construction withstands temperatures from -20 to 450 degrees F. The union design allows quick disassembly for maintenance or reconfiguration without cutting pipe. It frees up layout flexibility where rigid couplings would complicate future changes.

Upgrade from lower-class or permanent joints

This fitting replaces Class 150 unions or solid couplings when system pressure or steam service exceeds their limits. The jump is worth it when design pressure approaches 600 psi at 150 degrees F or when saturated steam reaches 300 psi. It is not for systems requiring smaller pipe sizes, different thread types, or lower temperature ranges.