Camlock Fittings SNAPLOCK® Camlock Coupling, Type D, Fitting/Connector Type: Coupling, 4 in Nominal Size, Cam and Groove Female Adapter x FNPT, 100 psi, Aluminum, Gravity Casting
Type D couplers are normally used with type A adapters but can be used with Type E and F adapters and DP (dust plug) of identical size.