The Clack V3007-12LF connector kit is used to plumb any system using the Clack WS1 control valve. The kit is comprised of two SharkBite fittings that will receive 3/4" copper, PEX, or CPVC. The kit comes complete with o-rings, retainer rings, and nuts for easy connection to the Clack bypass or directly to the control valve. These fittings are an extremely popular choice for residential applications where ease-of-installation is a priority. They are also very secure.