"Constructed of heavy-gauge steel with tough, appliance-like finish. Replaceable air/water separator prevents corrosion and bacterial growth - in compliance with FDA regulations. Tank is factory pre-charged to 40 PSI. Pre-charged tanks are rated to compare with equivalent-size conventional standard tanks in terms of water draw down between pump cycles. The actual physical size of a pre-charged tank is much less and allows space savings up to 50 when comparing draw-down and size to that of a conventional tank. Economy is achieved with the smaller size of pre-charged tanks compared to similar water delivery and size of conventional tanks. This tank has a rated size of 120 gallons the actual tank capacity is 50 gallons. U.S.A. Max. Capacity gal. 120, Dimensions D x H in. 24 x 37, Max. PSI 50, Includes Tank, Material Steel, Discharge Port in. 1 1/4. Designed to keep pump starts to a minimum Increases pump life and saves energy Drawdown, Gallons@PSI 20/40 PSI-18.3@20/40 PSI 30/50 PSI-13.5@30/50 PSI Discharge Size 1 1/4in."