I designed some caps to cover my spare beer lines, which are 3/8". I used the caps for the end of the lines and the plug for pushing into connectors like keg taps and beer dispensers. I changed the Z height on the caps to 300% to allow for deeper connectors; the internal diameters can act as a cap for the Lindr air adapter. For smaller air connectors on the Lindr machines, scale the X and Y to 83.33% and keep the Z at 300% to act as a blank for the air connection on the dispenser.