Watts Aqualock 3/8" O.D. x3/8" O.D. Tube Quick Connect Union. It is made of plastic and has a pressure rating of 60 psi and an operating temperature of 140 degrees Fahrenheit. It is suitable for use with copper, polyethylene, and polypropylene tubing. Design allows for quick and easy connections to pipe without installation tool. Use on copper, PEX, CPVC and polybutylene pipe. Product meets all National Plumbing Codes. Packaging: 1 Pack.