The CMI Inc Tankless Water Heater Service Valves Kit allows you to easily connect your Tankless Water Heater to your water supply for easy maintenance and control. With your purchase you will receive:(1) Hot Valve,(1) Cold Valve and (1) Pressure Relief Valve and a free PTFE Tape. The valves connect to the Tankless Water Heater with a 3/4 in. IPS Female connection. The small design makes it easily accessible and can fit in tight spaces.