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A plastic mounting ring comprises two plastic arcuate members each having a flat upper profile, a flat lower profile and a predetermined thickness. Each plastic arcuate member has a lip extending radially inwardly with an inside diameter that allows it to engage the sides of the channel formed by th

A plastic mounting ring comprises two plastic arcuate members each having a flat upper profile, a flat lower profile and a predetermined thickness. Each plastic arcuate member has a lip extending radially inwardly with an inside diameter that allows it to engage the sides of the channel formed by the flange on the water closet coupling on which it is to be mounted. A corresponding first end of each arcuate member has a notch out of the lower level of its thickness. A second corresponding end of each arcuate member has an extension, coplanar with its flat lower profile, which engages the lower surface of the base of the opposite end of the other arcuate member. The members are fitted together to form a mounting ring having a flat upper profile and a flat lower profile. The mounting ring can be used to replace a flange formation of an installed water closet coupling without removing the total water closet coupling. According to the method, a part of a flange formation is cut away from the installed water closet coupling so that no remaining portion of the installed water closet coupling is wider than the installed connecting pipe. A replacement water closet coupling is provided having a replacement connecting pipe with an inside diameter greater than the outside diameter of the installed connecting pipe to an extent which causes the replacement connecting pipe to fit closely around the installed connecting pipe. A replacement water closet is installed by mounting the replacement connecting pipe around the installed connecting pipe.

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1. A plastic mounting ring for use with a water closet coupling which can be interposed between a water closet drain and a sewer pipe, the water closet coupling having a flange near its inlet end which forms a radially extending channel that retains said mounting ring, said plastic mounting ring com

1. A plastic mounting ring for use with a water closet coupling which can be interposed between a water closet drain and a sewer pipe, the water closet coupling having a flange near its inlet end which forms a radially extending channel that retains said mounting ring, said plastic mounting ring comprising:(a) two plastic arcuate members each having a predetermined thickness, a flat upper profile, a flat lower profile, a corresponding first end and a corresponding second end; a lip located on the inside of the arc of each arcuate member, said lip extending radially inwardly with an inside diameter which allows said lip to engage sides of the channel formed by the flange so that each arcuate member can be retained on the coupling; (b) said first end of each arcuate member having a notch of a pre-selected length and a pre-selected height out of a lower portion of its thickness; (c) said second end of each arcuate member including an extension having one side which is coplanar with said flat lower profile of said arcuate members, said second end having a thickness substantially equal to the pre-selected height of said notch and a length no greater than the pre-selected length of said notch so that the extension can be fitted into the notch to enable said two arcuate members to be fitted together to form said plastic mounting ring; (d) each of said arcuate members having a slot for connecting said mounting ring to the water closet; and (e) each of said arcuate members having holes for connecting said mounting ring to a floor.