| 摘要 |
A filling recess ( 25 ) for a sealant "s" is formed in a bottom of a fitting recess ( 22 ) and a boundary stepped surface ( 30 ) is formed around the filling recess ( 25 ) to define an annular area between the filling recess ( 25 ) and the outer peripheral edge of the boundary stepped surface ( 30 ). A detecting stepped surface ( 34 ) is formed around the upper edge of the filling recess ( 25 ) and is slightly lower than the boundary stepped surface ( 30 ). A filled amount of the sealant "s" is proper if the detecting stepped surface ( 34 ) cannot be seen, but the boundary stepped surface ( 30 ) can be seen. The filled amount is too little if both stepped surfaces ( 34, 30 ) can be seen, and it is excessive if neither of the stepped surfaces ( 34, 30 ) can be seen.
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