The 7mm inflation valve used on older kites. Don't confuse this with the 9mm inflation valve. They look the same but this one is pretty small.
This 7mm inflation valve comes on a 4" 'peel and stick' base so you can replace valves that have failed or are damaged. This valve can also be used to assemble new replacement bladders.
The valve has a membrane check flap that you can remove if you want air to be able to exit without having the pinch the valve (remove it before you stick the valve to something).