Step 5 · Disconnect Toilet Tank Supply Hose
With the water off, place your bucket or towel directly under the connection point where the flexible water supply hose meets the bottom of the toilet tank. Using an adjustable wrench or channel-lock pliers, grip the coupling nut on the supply hose and turn it counter-clockwise to loosen and disconnect it from the tank's fill valve. A small amount of water will drain from the hose and tank, so be prepared.