Push 'n' connect faucet install hook up kits are a fast installation requiring no special tools. No solder, no flux, no flame, and no fire hazards are involved. Push'n'connect is made of high quality materials including a stainless steel gripper ring and epdm o-ring brass body. Includes pex connection insert stiffeners with every fitting. It is certified to 200 psi at maximum temperature of 200?f.