Value Brand 2-1/2" Malleable Iron Union

2-1/2" Malleable Iron Union

This 2-1/2 inch union connects pipes with female NPT threads in plumbing and industrial systems. The malleable iron body meets ASME B16.39 and ASTM A197 standards for reliable service. It is rated for 600 psi at 150 degrees Fahrenheit and handles saturated steam up to 300 psi. Builders needing a different pipe diameter or a welded connection cannot use this fitting.

Class 300 Schedule and Temperature Range

The Class 300 rating defines the wall thickness and pressure boundary for the 2-1/2 inch size. Operating limits span from -20 degrees to 450 degrees Fahrenheit, covering chilled water, hot water and low-pressure steam lines. This range and class combination determines where the union fits in a piping specification. Installers requiring a higher pressure class or a broader temperature span must select a different component.

FNPT Threaded Installation

The union installs by threading each end onto male NPT pipe nipples, then tightening the central nut to seal the joint. No welding, soldering or special tools are required beyond standard pipe wrenches. Leaks usually come from insufficient thread sealant or from cross-threading the nut during assembly. Proper thread engagement and a compatible sealant prevent most field failures.