| 摘要 |
A method of using a toilet-flange cast-in mount (10) that has a bottom end portion (16) which is of a female pipe coupling size for coupling with a three inch pipe (24) and a top end portion (18) of a four inch pipe size. The toilet-flange cast-in mount has an intumescent-material collar (26) at its bottom end portion for closing the bottom end portion and the three inch pipe coupled therewith. The top end portion can be mated with a toilet flange (38) having a mounting stub portion (40) with an outer diameter of four inches.
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