I picked up a bigger syringe at the vet and hooked up the brass connector with some fuel line. Using a t fitting attach a one way check valve to one outlet of the t fitting with the other end of the check valve open to atmosphere. Install check valve so air can flow into the syringe when when you pull it back and it seals off when you push in on the syringe forcing the air into the tire. If you want to insure you don't loose any air from the tire you can install a secound check valve in the line to the tire in such a way the air can go into the tire but can't get out. Pump away. And it fits IN your flight box.