Avon A7 Inflation / Deflation Valves. Of the 3 Avon valves used, this is the earliest vintage and can be identified by the two "nubs" that are located on either side of the cap.
Avon B7 Inflation / Deflation Valves. Of the 3 different valves used, this was the second generation and can be identified by the 3 points coming from a circle on the cap.
Inflatable Boat Transom Drain Plug Assembly Kit with Flip-Up Plug.