Simplify your plumbing projects with the John Guest female shut-off valve. Made from polypropylene, this push-to-connect fitting requires no tools or glue for a secure, leak-free connection. This plumbing shut-off valve is fitted with food-grade EPDM O-rings and is FDA-compliant. These safe and durable shut-off valves are approved for behind-the-wall applications as a permanent leak-free connection and are certified for use in potable water and hydronic heating system applications. John Guest plastic push female angle shut-off valves are rated at 150 PSI at 70 degrees Fahrenheit and 60 PSI at 140 degrees Fahrenheit.