Value Brand Malleable Iron Union 1-1/4" NPT Class 150

Malleable Iron Union 1-1/4" NPT Class 150

This galvanised malleable iron union joins two 1 1/4 inch NPT female threads in a Class 150 pressure rating. It is suited to plumbing installers and maintenance crews who need a separable joint for steel or iron pipe systems. The fitting is supplied new and carries a California Proposition 65 warning for listed chemicals. Buyers who require a different thread size, a higher pressure class or a non-galvanised finish should select another fitting.

Class 150 pressure rating

The single specification that determines suitability is the Class 150 rating, which defines the maximum allowable working pressure for this union. Both ends are 1 1/4 inch NPT female with 11 1/2 threads per inch. Confirm that the system design pressure and thread standard match these values before installation. No other pressure class or thread form is compatible with this part.

Capacity and headroom

The union comfortably handles standard water, air and oil lines operating within Class 150 limits at ambient temperatures. It runs out when system pressure exceeds the Class 150 rating or when the media attacks galvanised malleable iron. Installations requiring higher pressure classes, larger diameters or corrosion-resistant alloys will need a different fitting.