PURPOSE: To surely seal a bore and to tightly fit an equipment by inserting an elastic disc having a good sticking characteristics and friction between a building wall and equipment.

CONSTITUTION: Bores 10 and 10 are opened on a building wall 1, especially the tiled walls of a shower room, bathroom, kitchen, etc., where dowels 11 and 11 an dowel screw are inserted to fix equipments such as a shower reception part 32, etc. Related to the fixture, an elastic disc 2 having relatively good sticking characteristics and friction is inserted between the building wall 1 and equipment. The disc is preferred to be formed of rubber or sponge rubber of about 1 mm thickness and Shore A hardness of about 65. Thus, after an equipment is fitted, a water is prevented from getting into the bore 10 in the building wall 1.