The Tectite by Apollo 3/4 in. Bronze Direct Push-To-Connect Water Pressure Regulator is designed to reduce incoming water pressures to a safe level to protect plumbing fixtures and appliances. They assist in the control of pressure surges from entering the structure from the water main to further protect fixtures and appliances. Excessive high pressure within a plumbing system can cause damage over time. A pressure regulator should be installed after the main line to help protect plumbing. Featuring a superior flow rate, durable construction, and fitted with Tectite by Apollo Push-To-Connect technology, the 36ELF can be installed on any combination of Copper, CPVC, or PEX Pipe.