A pump for use in marine environments including a pump housing having a cap portion and a main portion, a pump intake pipe attached to the main portion, a pump assembly attached to the cap portion is described. A pair of clips extending from said cap portion extend over a pair of raised surfaces on said main portion. Rotation of the cap portion moves said clips from a low end of the raised surfaces to a high end, thereby locking the cap portion to the main portion. In another embodiment, a locking ring fits over the junction between the cap portion and the main portion. The ring includes an inwardly directed upper flange and a plurality of inwardly directed protrusions on a lower extent. The ring fits over the cap portion such that a flange from the motor housing and one or more flanges from the main portion are caught between the upper flanges and the protrusions of the locking ring. The pump may be a removable live well pump or a bilge pump.