California Air Tools AUX20S - 20 Gallon Steel Auxiliary Air Tank is designed for portability and ease of use. The lightweight and easy carry designs make transporting this air tank very easy.California Air Tools auxiliary air tanks are designed to provide an extra supply of air needed for short-term demands such as inflating tires. These auxiliary air tanks provide stable pressure and a constant air flow for purposes such as spray painting. Having the California Air Tools auxiliary air tanks will allow you to have an extra supply of air for more time before the air compressor motor/pump starts to run. The Easy to Use Industrial Quick Connect Fittings on the Air Hose and Air Valve allows you to quickly attach the Air Hose to an air compressor and fill the auxiliary air tank without needing extra air fittings. This Easy to Use Quick Connect System also allows you to connect a standard air hose to your air valve for use with air tools.