Gates 33019 195f Thermostat 195 Degree Reverse Poppet Design Opens against the flow of coolant from the water pump The coolant, under water pump pressure, is used to help the reverse poppet thermostat stay closed when cool to reduce leakage The offset thermostat with jiggle pin valves is equipped with a special valve in the flange 2-5/16" x 25/32" x 1-13/32" x 1-3/16" w/Seal