To provide a bowl-shaped seat capable of securing designability of a wall surface and a pipe penetration part to improve appearance by absorbing errors even if the wall surface is not vertical to the pipe penetrated into the wall surface and a slight inclination occurs therebetween.
This bowl-shaped seat is formed generally in a bowl shape. A short cylindrical body 2 through which a pipe 20 extends is vertically and inwardly installed at the center of the cover. The pipe extends through the cylindrical body. The edge 3 of the bowl-shaped seat is fixedly brought into contact with the wall surface 30. The minimum diameter of the cylindrical body is made equal to the diameter of the pipe, and the diameter thereof vertical to the minimum diameter is slightly larger than the diameter of the pipe. Specifically, the outline of the cylindrical body is formed in an elongated shape or an elliptic shape, and the inward end diameter of the cylindrical body is converged.
OKAMOTO KOICHIRO
Kato Kazunori
Katsuichi Nishimoto
Hiroshi Fukuda
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