Adapter so I can use my air compressor to fill our paddle boards. Compatible with a Leafield C7 Valve. Top accepts a Schrader Valve with 1/4" Male NPT such as:
https://www.amazon.com/GODESON-Pieces-Anti-Corrosion-Schrader-Compressor/dp/B08975661L

Doesn't consistently hold pressure so it needs to be removed and have pressure checked with regular pressure gauge. It's somewhat accurate while filling so you can get close without exploding the board.