. SEALS OUT LEAKS AND PREVENTS DEBRIS AND MATERIALS FROM ENTERING PUMP.1-1/4" Polypropylene Camlock Fitting - Male Barb x Female Coupler Thread THESE CAMLOCK FITTINGS ARE MADE OF IMPACT RESISTANT POLYPROPYLENE THAT IS GREAT FOR NYLON TRANSFER PUMPS AND GENERAL PURPOSE WATER PUMPS. DUST CAPS & PLUGS HELP SEAL INTAKE AND OUTLET OPENINGS ON WATER PUMPS AND HOSES FOR CLOSURE WHEN NOT IN USE.