Nibco 1/2" C×C union is a plumbing fitting designed to join two copper tubes of ½ inch via sweat (solder) or “cup” connections on both ends (C = copper). The union allows serviceable disconnection of a section of the copper piping system without having to cut the pipe—useful for repairs or replacement of components. Nibco’s version is manufactured from cast copper or bronze alloys and is backed by a 50‑year limited warranty under typical conditions.