Aztek 9313C Air Can Adapter designed for model airbrushing. This adapter allows for the connection of Testor Ozone Safe Propellant to Aztek 2000S, 3000S, and 4000S airbrush models. The item consists of a brass-threaded plastic valve unit in its original, though shelf-worn, blister pack. The packaging shows visible wear, discoloration, and a price sticker from a previous retailer.