Abstract: A bung plug assembly (30), of a type including a tubularly-shaped housing (32) having a grommet cap (34) at one end thereof, also includes a hard-material bulkhead adapter assembly (37). The bulkhead adapter assembly includes a bulkhead adapter (69) with a smooth-surface bulkhead-adapter bore (41) therethrough and a separate bulkhead-adapter nut (80). The bulkhead adapter has a tube portion (70) with left-hand male threads thereon and a radially-outwardly extending flange portion (74). The tube portion is extended through a grommet cap bore (40), until the flange portion abuts on a surface of the grommet cap, for also being extended through an opening (88) in a wall (39) of a life raft canister. The separate bulkhead-adapter nut is for being screwed onto the tube portion for clamping the wall of the life raft canister between the bulkhead-adapter nut and the grommet cap.