| 摘要 |
PROBLEM TO BE SOLVED: To display a perfect jumping-out preventive function, and at the same time, simplify the structure, save a material to be used, and easily manufacture even by a modification to an already existing spear tube type plug. SOLUTION: For a plug exclusively for pressurized beer barrel, a body part 50 which is screwed onto a mouthpiece 4 under an airtight state, a down tube 6 which is extended to the vicinity of the bottom part of a beer barrel 1, and a jumping-out preventive piece 73 which elastically deforms toward the inside from the internal diametrical part of the mouthpiece when being inserted in the mouthpiece 4, then, protrudes in the radial direction from a side surface opening 55 after the insertion, and returns in such a manner that it may sufficiently come into contact with the lower edge part 4a of the mouthpiece 4, are provided. |
