Fix a plumbing leak and get your toilet back into service ASAP by DIY-ing a toilet shut-off valve replacement.

Step 2: Drain the water lines. Before you remove the toilet shut-off valve, you’ll need to drain the supply line to prevent the water remaining in the pipe from gushing out onto your bathroom floor.

The sizes you'll see on the packaging refer to the diameters of the two connections — one for the supply valve, and the other for the underside of the toilet. Supply lines come in two common siz ...