Patent ID: 8453685

Claim:
A detachable coupling useful for transferring a liquid from a first reservoir to a second reservoir comprising: a) a first coupling fitting attached to a first reservoir containing a liquid that is to be transferred to said second reservoir; b) a second coupling fitting attached to said second reservoir, said second coupling fitting being complementary to said first coupling fitting; said first coupling fitting and said second coupling fitting each comprising a spring-biased quasi-cylindrical shell slidably disposed within a cover, said shells each having a hollow interior and an exterior wall, said exterior walls being configured sufficiently to cause, upon the engagement of said coupling fittings with one another, the opening of a first passage through which said liquid passes, and the opening of a second passage that is separate and distinct from said first passage through which vapor passes through said fittings, the liquid passage being the interior of said shells and vapor passage being exterior to the walls of said shells, said exterior walls comprising a portion of the boundary of the second passage.