Abstract: A coin vault assembly for a self service air machine for gasoline stations. The coin vault assembly is part of a vertical base of the air machine. There is a recess in the vertical base which houses the coin vault assembly at a depth which can not be actively tampered by hacksaw, chisel, etc. The coin vault assembly has a rectangular shape with an open end covered by a pivoted removable door that pivots in a slot in the coin vault. There is a lock extension which passes thorough a slot in the door to receive a padlock. A crescent shaped lock protector further protects the lock from tampering or forced action.