Inner Hull Drain Plug with Housing for Inflatable RIB Boats
Inner Hull Inflatable Boat Drain Plug with Housing - Generic
Mercury Inflatable Transom Slide Bailer
Mercury Inflatable transom slide bailer. This can be retrofitted to any transom that has a 1-3/8"( 35mm) transom drain hole.
Achilles, Avon & Zodiac Self Bailer Transom Valve Plus Gasket (Achilles Part #C441A)
Achilles Self Bailer Transom Valve with Rubber Gasket
Inflatable Boat Drain Plug Assembly Kit, with 7/8″ Flip-Up Drain Plug
 Inflatable Boat Transom Drain Plug Assembly Kit with Flip-Up Plug.