Sharkbite, 1/2" x 1/4", push fit reducer coupling, allows you to make a connection from 1/2" pipe & reduce down to a 1/4" pipe, easy way to join copper, cpvc or pex pipe in any combination with no soldering, clamps, unions or glue, just insert the pipe & the stainless steel teeth bite down & grip tight, while a specially formulated o-ring compresses to create a perfect seal, disassembly is just as fast using the simple disconnect tool so fittings & valves can be easily changed & reused.