Fits most inflatable boat valves with a bayonet lock in style connection and a 3/4" hose. Bayonet fits many inflatables such as AB, Caribe, Walker Bay, Mercury, Nautica inflatables, Zodiac Zoom or any brand that uses Halkey Roberts, push push, or Bravo 2005 inflatable boat valves. Built by Bravo for Bravo pumps and other brands. The end that fits into the hose is 3/4" in diameter. By removing the ring adapters, the bayonet can make shorter or longer depending on the brand of valve.