| 摘要 |
To make it possible to easily recognize, from an external appearance, whethe r or not a waterproof tight-sealing level of a coupler penetrating a meter cas e is adequate. A coupler which is fixed to a meter case (lower case) includes a sleeve which penetrates the case and a flange which overhangs from the sleev e to a circumference thereof. An annular groove holding a seal ring is provide d in the flange. A step as a mark is provided on an outer circumference of the sleeve in order that an adequate compression amount of the seal ring can be recognized from the external appearance. This step is aligned with an outer surface of the lower case when the seal ring is compressed up to the adequat e compression amount.
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