Use this accumulator tank to add a little buffer when working under obstructions, or using lift bags or air tools. Mount more than one diving air tank for bigger jobs. 2.5 gallon air accumulator tank measures 23 inches to top of valve by 7.5 inches wide. Weight is 5.5 pounds. Ports are compatible with standard hose fittings. A ¼ inch npt female port with plug on top for scuba SPG pressure gauge (not included).