A livewell/baitwell pump for installing in a boat or other suitable vessel or apparatus, the pump comprising a pump cartridge assembly having a cartridge body with one or more flexible cantilever snap tabs and with a discharge hose; a pickup tube having an interior cavity with one or more undercuts and with a pickup tube; and each cantilever snap tab of the cartridge body being releasably coupled to a respective undercut of the pickup tube when the cartridge body is inserted into the interior cavity for permitting rotation of the pickup tube and the cartridge body in relation to one another for quickly and easily coupling the discharge hose and the pickup tube in any direction to corresponding hosing or tubing during installation of the pump in the boat or other suitable vessel or apparatus. The pump further comprises an anti-rotation locking ring that permits the rotation of the pickup tube to a desired orientation in relation to the pump cartridge assembly when the anti-rotation locking ring in a first position, and that prevents rotation of the pickup tube once in the desired direction in relation to the pump cartridge assembly when in a second position.