Watts 1/2"" FIP A200T Flow-Through Trap Primer (0295121) Watts 1/2"" FIP A200T Series Flow-Through Trap Primers are used in commercial and residential applications to assure delivery of water to floor drain traps to prevent the evaporation of the water seal that protects a building or room from sewer gas fumes. It consists of a bronze body construction with a Celcon seat and disc. Available in threaded connections. Minimum Supply Pressure: must exceed 25psi (172kPa), Maximum Supply Pressure: 125psi (8.6 bar). Size Range: 1/2 in. (15mm)"