Union

A union is a multi-piece mechanical joint that permits two piping sections to be disconnected without rotating a long adjoining pipe run. The general product name does not establish whether its ends are threaded, socket-weld, or mixed, and that distinction materially changes assembly, sealing, and selection. It must not be treated as a one-piece coupling, flange, or dielectric union. The end form, seating arrangement, and exact identity require confirmation before specification. Final selection depends on end type, sealing interface, material, and maintenance requirements.