Abstract: The present invention relates to a filter structure for a nailer, wherein a step periphery and a groove are formed on an inner wall of a nailer, a filter plate is disposed in the step periphery, and then a fastener is received in the groove for limiting the filter in the step periphery of the nailer. Thus the filter plate will not fall off when the user assembles and disassembles other components of the nailer. In addition, the filter structure is able to prevent the filter plate from being deformed when the user assembles and disassembles other components of the nailer.

Abstract: The present invention relates to an end cap assembly for a nailer whose bush ring is disposed between the end cap and the moveable member, at the inner periphery and the outer periphery of the bush ring is formed an annular protrusion, respectively. At the bottom of the bush ring are provided a bush block and a plurality of backing ribs, around the periphery of the bush block are formed a plurality of spiracles. The bush ring has multiple functions and is able to take the place of the inner seal ring, the outer seal ring, the buffering cushion and the like components of the conventional nailer. Thus, the structure of the end cap is simplified. The bush ring is formed by integral plastic ejection, thereby, the production cost and the concurrent assembly time are saved.