Build a new drain valve with a 3/4-inch full-port brass ball valve with threaded ends, a 3-inch x 3/4-inch galvanized nipple and a 3/4-inch MIP x G.H. garden hose adapter (one choice is the ...

The drop in the tank's water level is sensed by a float, ball, or pressure gauge in the fill valve, and this triggers water to refill the tank through the flush valve. When the tank is full, the ...