What about Schrader valves? Zilch works with Schrader valves, but you must use one of the included adapters. These adapters thread onto the Schrader valve and can be left in place without air loss.

A Maglite was chosen due to its high durability, and easy access to the internals. A schrader valve sticks out of the battery cap, which allows the gun to be charged using a standard fitting.

Valve stems on Budd wheels, dual wheels and some equipment wheels can be in plain sight, but at just enough angle so it’s impossible to get a tire pressure gauge or air chuck on the Schrader valve.

Charging the cannon is done via a Schrader valve, as you might find on a bike’s inner tube, and firing is achieved via a ball valve. Of course, if you build such an air cannon yourself ...