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Installing new toilet plumbing will solve all water supply problems. Place the threaded part of a flush-valve seat into the large drain hole in the center of the tank. Hands tighten its nut on the bottom of the tank. Tighten the nut half a turn with locking pliers. Be careful not to over tighten. The flush-valve seat has an overflow tube connected to its base on the opposite side of the threads.

Set the tank on the bowl. Line up the round part of the rubber flange with the bowl's water intake hole. Slide the toilet-tank bolts through their gaskets and into the mounting holes inside of the tank and continue sliding through the bowl's holes. The bolts should extend half an inch past the bowl's holes. Place a metal washer and nut on each bolt. Hold the bolt still with a flat screwdriver. Finger tightens each nut.