replace old, worn out or broken camlock ends and couplers. These camlock fittings are made of impact resistant polypropylene that is great for nylon transfer pumps and general purpose water pumps. Camlock ends help easily attach hoses and tubing to water pumps. Dust caps & plugs help seal intake and outlet openings on water pumps and hoses for closure when not in use. Seals out leaks and prevents debris and materials from entering pump.