Midland Industries CGF-3040-A Type F Cam and Groove Reducer Adapter, 3" Male Adapter x 4" Male NPT, Aluminum

Type F cam and groove fittings feature a male nipple (adapter) by Male NPT connection. These Type F fittings are commonly paired with Type B adapters of matching size, but they are also compatible with Type C and D adapters, as well as Type DC dust caps.