Watts Premier 0955801 Sensor Valve Kit for Watts Hot Water Recirculating Pump (0955800) CONTENTS: Includes a sensor valve, two 12 in. supply lines with fittings, and two mounting screws SPECIFICATIONS: 1/2 inch MPT connections on the Sensor Valve, 12 inch supply lines with 1/2 inch FPT x 3/8 inch FPT connections, and the adapter fittings with 1/2 inch FPT to 3/8 inch MPT COMPATIBILITY: The 0955801 Sensor Valve Kit is only for use with Watts Instant Hot Water Recirculating System. It is not designed to be used with a dedicated return line to the water heater EASY INSTALLATION: Easy to install with no additional pumps needed. Additional sensor valve for branched hot water lines