Push-to-connect fittings for potable water systems AquaLockTM by Watts offers the most flexibility and superior performance with no tools. Whether your tubing is PEX, copper, or CPVC, AquaLock has you covered with a stainless steel gripper ring that is resistant to corrosion and interlocks with multiple materials without any tools. Those who know best know when you need a connection you can count on... AquaLock it Down.