A Y McDonald CTS Polyethylene Pipe Brass Tee CTS copper tube size x CTS X CTS compression tee for Type K or L copper tube, ASTM American Society for Testing and Materials D2737 SDP-9 Polyethylene tubing, ASTM F876 DSR-9 PEX tubing, and ASTM D2666 SDR-9 Polybutylene tubing. Brass fitting includes EPDM Ethylene Propylene Diene Monomer Rubber gasket, anti-friction ring, Mac-Pak nut with split clamp, and stainless steel screw. Insert stiffener is required when used with plastic tubing. Size 3/4 In. CTS, Material Brass, For Use With Polyethylene Pipe, Pkg Qty 1 WARNING This product can expose you to chemicals including lead which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov