PROBLEM TO BE SOLVED: To provide a fitting bush of a draft beer barrel in which the degree of degradation and the lifetime of a sealing material caused by secular change of the sealing material to be used, and necessity of exchange of the sealing material can be correctly determined and detected at a glance.;SOLUTION: The bush comprises a flange part having the outside diameter to cover an upper end face of an outer circumference of a mouthpiece fixed to an upper face of a draft beer barrel body, an intermediate part which is continuous to the flange part via a stepped part with an outer circumferential surface thereof being screwed to an inner circumferential surface of an upper portion of the mouthpiece, a skirt part continuous the intermediate part via the stepped part, and a sealing member to be interposed to the stepped part between the skirt part and the intermediate part and the stepped part at a bottom part of the inner circumferential surface of the mouthpiece. The length in the axial direction of the intermediate part is set so that a space of the adequately determined reference dimension between the outer circumferential bottom surface of the flange part and the upper end face of the outer circumference of the mouthpiece when the sealing material is under a predetermined compression.;COPYRIGHT: (C)2005,JPO&NCIPI
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