Sharkbite, 4 pack, 1/2″ fnpt x 1/2″ connector, connects copper, cpvc or pex pipe in any combination with no soldering, clamps, unions or glue, insert the pipe & the stainless steel teeth bite down & grip tight, while a specially formulated o-ring compresses to create a perfect seal, disconnect tool allows for fittings & valves to be easily changed & reused, can be rotated after assembly for easier installation in tight spaces, certified for potable water supply & hydronic heating applications.