Mueller Industries PC633-3 Copper 3/4" Press x Female Union

The Mueller Industries Press System wrot copper union features an inboard bead and EPDM O-ring. Simply applying pressure from a press tool tightens the O-ring onto the tube, ensuring a clean, watertight seal in seconds with no flame, solder or flux. The union has press connections and a female NPT thread. It is used to allow repair to the line without damage between a press connection and threaded connection.