5 Pack, 3/4"x1/2" Pex Coupling. Simplify your plumbing projects with the SharkBite poly crimp reducing coupling fitting. Composed of strong and sturdy Acudel Polymer, this straight PEX fitting is perfect for connecting two pieces of same size PEX pipe together using copper crimp rings or stainless steel clamps without the need for any additional tools, glue or soldering. This coupling connector is certified for use with potable, hydronic and radiant applications. Water service coupling features a minimum working temperature of 33 degrees F at 160 psi, and a maximum working temperature of 200 degrees F at 80 psi.