This kind of capper machine is mainly used for sauce products. Some drinks of Pepsi Cola also adopt lug caps. However, lug caps must be applied to glass bottles so that it is hardly to be widely used. The best advantage of this kind of cap is that it can be provided with a vacuum access hole for the consumers to see whether the product has deteriorated. Before the capping process, the bottle and its content must be heated. During the whole process of capping, steam is necessary to remove the air inside the bottle. Vacuum is formed in the bottle after capping and cooling down which can ensure the quality of the content in the bottle.