Marsh float for 3/4" and 1" 2, 15 pound pressure, F&T traps. Floats allow condensate to drain from the trap and attach to the valve mechanism on F&T traps. The mechanism is a lever and seat operation and is held in place by screwing the seat into the outlet port within the trap. The weight of the float keeps the lever down, in turn keeping the seat closed when steam is present. When the steam cools and turns to condensate, the trap fills causing the float to rise and opening the seat to allow the condensate to drain.