| 摘要 |
PROBLEM TO BE SOLVED: To easily enable confirming of accidental mounting, when a sealing ring is mounted and preventing the sealing ring from being mounted in the reverse state. SOLUTION: The sealing ring 41 has a thicker dimension between an outer peripheral ring face 41b of the sealing ring 41 and an inner peripheral ring face 41a including a key part 42, formed on the inner peripheral ring face 41a than the dimension between other part of the inner peripheral ring face 41a of the sealing ring 41 and the outer peripheral ring face 41b. An outer peripheral face 15f of a fitting part 15 includes a key receiving part 18 corresponding to the key part 42 and is formed as a shape, corresponding to the inner peripheral ring face 41a.
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