Characteristics 1. American plastic bucket bung design: namely, strengthening the strength of barrels, but also to avoid the traditional bunghole rim too thick to produce shrinkage problems. This design can easily be increased width barrels 7mm, which can be effective to prevent the phenomenon of barrel jump cover 2. The second channel, oblique stiffener design 30-degree angle at the third, the use of pole arc enhancement principle increased resistance to deformation barrels. 3. The third recurved ribs, can effectively prevent a collision course with each other bottled cargo transport, will not let the pressure side of the barrel to another pail, resulting in breakage of the situation. The unique design can reduce barrel lid undercut barbs off from time to time turned out strong deformation, allows undercut the arm at a 90 degree angle. 5 the inside of the lid to the center strut, effectively strengthening the back cover with the lid barrels barrels fit. 6. During transport, on the possible link between the lower barrel jump, three circular design like a spring part to alleviate this momentum, in order to better protect the seal, so that the seal is in a stationary state, effectively prevent outside air from entering.