For use as a replacement Sensor Valve for the Watts Sensor Valve Kit or Instant Hot Water Recirculation Pump. | Requires the installation of an existing sensor valve and a Watts Instant Hot Water Recirculation Pump (Does not include Sensor Valve Components). | Increases speed of water recirculation | Easy to install as replacement with no additional components needed | Do NOT use thread sealant tape or pipe dope on the Sensor Valve threads