Unions

A union fitting is a detachable screw connection with a union nut that allows radiators, pumps, filters or meters to be easily connected and disconnected again without having to dismantle the entire pipework. Sealing is provided by a flat washer between two mating surfaces.

We offer brass union fittings in straight and angled versions, sizes 1/2", 3/4" and 1", suitable for both heating and water systems.

Frequently Asked Questions

• What is a union fitting used for? For the detachable connection of radiators, pumps, filters or meters to the pipework.
• What is the difference between a straight and an angled union? A straight union continues in the direction of the pipe, while an angled union changes direction by 90° and replaces an elbow and union in a single piece.
• What seals a union fitting? A flat sealing washer between two flat mating surfaces – neither hemp fibre nor tape is needed on this joint.