Abstract: A modular toilet bowl assembly bowl assembly that allows adjustment of the relevant dimensions of the inlet of the outlet as well as the height of a toilet bowl without modifying the toilet bowl body. The toilet bowl includes a toilet bowl and upper drain pipe portion that are formed integrally as a single piece, a lower drain pipe portion that is formed separately from the toilet stool. The lower drain pipe portion may be formed of a series of parts having known dimensions so that by interior moving predetermined parts, the length or height of the toilet bowl can be adjusted.

Abstract: In connecting a flushing port (2) of a toilet stool (1) which is formed so as to face the floor surface to which the toilet stool (1) is installed to a drainpipe (3) of the building, the connection is made by means of a flushing-side connecting pipe (6) which connects to the flushing port (2), a drain-side connecting pipe (7) which connects to the drainpipe (3), and a linking pipe (8) which makes connection between the above-noted two pipes. In making the pipe connections, the linking pipe (8) is cut off in accordance with the distance between the flushing port (2) and the drainpipe (3) or pipe insertion overlap can be used to adjust the length of the linking pipe (8).