Watts Aqualock 1/4" OD Tubex1/4" OD Tube Quick Connect Union is designed for quick and easy connections to poly or soft copper tubing, without the need for installation tools. Made from high-performance thermal plastic material, it offers a pressure rating of 60 psi and an operating temperature of 140 degrees Fahrenheit. Suitable for use with copper, polyethylene, and polypropylene tubing, this union meets all National Plumbing Codes. Not intended for use with steel or in concealed installations.