Today in 1897, US Patent 592295 A was issued, an invention of George C. Kaohel and Henry Sager, for their “Bung and Faucet.” There’s no Abstract, although in the description it includes this summary:

This invention relates to new and useful Improvement in Bungs and Faucets, of which the following is a full, clear, and exact description.

without destroying the keg or cask, as frequently occurs under the old process, the faucet employed being particularly adapted for this purpose.

A further object of the invention is to provide a bushing and barrel to receive the faucet so constructed that the kegs or casks will be practically as clean when returned to the brewery as when taken therefrom, since all the liquid may be drained from the receptacle.

The invention consists in the novel construction and combination of the several parts, as will be hereinafter fully set forth, and pointed out in the claims.