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Remove the center of the toilet flange with a hammer and pliers.
Place two closet bolts to hold the toilet in place. Add washers on top of the bolts, then place the wax ring on the toilet flange.
Use a tubing cutter to cut the copper water supply line to the proper height (Image 1).
Cover the supply line with an escutcheon and attach the shutoff valve. Use two wrenches to tighten the valve (Image 2).