Abstract: A filter bag sealing device includes a sub-assembly that can be conveniently inserted into and removed from a filter housing. The sub-assembly comprises a filter basket, a filter bag, and an annular retainer. The three components are joined together by a locking mechanism that includes a pair of cams mounted to a shaft with stepped ends. The shaft extends between two lugs on the filter basket. A seal retained in the filter basket and a rigid ring in the mouth of the filter bag are placed between the filter basket and the retainer. Selectively rotating the cams draws the filter basket and retainer together to form the sub-assembly with a tight seal between the basket and retainer. The filter basket periphery includes a seal for sealing the sub-assembly to the inner diameter of the housing wall.