Aluminum tanks are lightweight and corrosion resistant. These units are extruded and 100% TIG welded for maximum quality. The 5-gallon option gives adequate air storage for typical vehicles with 4-Corner Air Suspension (Many will use (2) of these 3-gallon tanks instead). On some lightweight vehicles a single 3-gallon tank can offer adequate air storage. Click "Dimensions" below to see port configuration and dimensions.