The 1/2 in. CTS x 1/2 in. NPT Brass ProLock Push-to-Connect Drop Ear Elbow is the easiest and most dependable way to join PEX, or CPVC pipe in any combination 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 water and hydronic heating applications. The have been specifically designed for the Professional Plumber. This fitting is not suitable for potable water applications. Code approved for behind-the-wall installations. 25-Years warranty.