The Flair-It PEX, Tee is a versatile fitting compatible with any brand or type of SDR-9 PEX or PE-RT tubing as well as Polybutylene pipe. Made of durable polyoxymethylene, it meets cNSF-14pw and NSF-61 standards and is manufactured to ASTM standards F876/F877 and CSA 137.5 specifications. Installation is simple - cut the tubing square, slide the nut along the tubing, rock the fitting into the tubing, slide the nut back onto the fitting, and tighten it. For 3/4 inch Polybutylene pipe, use the #26790 PB Adapter Sleeve. This tee is perfect for professional installation of hot and cold potable water systems or DIY plumbing repairs.