The 1 in. CTS x 1 in. NPT Brass ProLock Push-to-Connect Male Connector is the easiest and most dependable way to join PEX or CPVC pipe in any combination to a female threaded connection with no solder, glue or tools required. SharkBite ProLock fittings use a collet with stainless steel teeth that grips the pipe when fully inserted and an EPDM O-Ring to provide a permanent, leak-proof seal. Disconnection is just as easy with no tools needed; simply depress collet against the fitting to remove the pipe. ProLock Twist-to-Lock fittings are suitable for hot and cold potable water and hydronic heating applications. The have been specifically designed for the Professional Plumber. They have been manufactured using Lead Free brass. Code approved for behind-the-wall installations. 25-Years warranty.