Part number 0005726850 is a flow switch for use with the 9001.5 alarm. Switch will activate at 1.5 gallons (3.8 L) per minute of flow. AC, 125/250 volts, 5 amps, double pole, double throw. 1/2" FIPS inlet and outlet. Class 1, Division 1, Group B, C, D. UL Listed.