| 摘要 |
This invention provides an oil-feeding coupling consisting of male and female coupling members capable of being engaged with each other only when predetermined portions thereof are opposed to each other, a guide ring fitted around the male coupling member and adapted to set an engaging position thereof in accordance with the kind of an oil to be fed to an underground tank, and positioning portions formed in the female coupling member so as to engage the guide ring therewith, whereby the male and female coupling members can be engaged with each other only when the guide ring is set in a predetermined rotary position with respect to the male coupling member.
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