These are 'Dunlop' or 'Woods' type valves. If you are curious how to inflate them just You Tube "How to Pump The With Woods valves" and you will get the info you need. Easy to mouth inflate, easy to install and ready to add to any of your projects!
This airtight valve is perfect for making inflatable items. Glues easily to latex, and comes with a rubber cover to make it minimally intrusive.
Base diameter: 1.5"
Valve height: 1.25"