Sealfast Fitting 3" A Camlock A300IAL
 
Type A adapters are normally used with Type D couplers, but can be used with Type B and C couplers as well as DC (Dust Cap) of identical size.

Replace Old, Worn Out Or Broken Camlock Ends And Couplers. Camlocks are made of lightweight, durable aluminum. 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.