Flair-It 16822 RV Fresh Water Plumbing Tee (2) 1/2″ PEX x (1) 1/2″ MPTFLAIR-IT fittings are constructed of durable Polyoxmethylene (POM) and are compatible with PEX tubing. The patented design consists of a nut and flared insert and requires no tools. The fitting inserts into inside of the tubing as well as a nut that is on the outside of the tubing, tightening creates a bond that can withstand up to 90 pounds of pressure.Durable: Constructed of a strong, light weight solid plasticNo Tools Required: Simply connect it to the PEX tube and tighten itAdditional InfoEnd 1 Size / Type1/2″ PEXEnd 2 Size / Type1/2″ PEXEnd 3 Size / Type1/2″ MPTFitting TypeTeeMaterialPlasticThe sizes listed do not correspond with their actual sizes. They represent the nominal size of the plumbing component they will accommodate. Example: 1/2″ PEX fitting will fit a 1/2″ PEX pipe, but the fitting will not measure at 1/2″.