|A must for anyone's shop! This handy unit screws onto any CO2 or HPA tank (NOT included) and allows you to fill tires, balls, etc. without having to pull out a bulky compressor or hand pump! The lever allows you to control the amount of compressed gas. Heavy-duty all metal construction. Very portable and economical to use. Tank can be refilled at any Paintball store or field and many sporting goods stores.