Replacement Bayonet Valve for older Innova kayaks. Might be used on other Inflatable Kayaks.
Valve is 2 3/8 inches in diameter, with a spring loaded one-way opening.
The photo above shows valve open. The photo to the right shows valve closed.
See videos at links below.
How The Valve in Your Innova Inflatable Kayak or Canoe works - Valves starting in 2010
How The Valve in Your Innova Inflatable Kayak or Canoe works - Valves up to 2010