The Air Venturi 13 oz. aluminum high pressure air tank is the perfect pairing for many airguns and a common modding accessory. It's particularly useful for Sig Sauer MCX/MPX owners. Fill the tank to 3,000 psi, as indicated on the built-in pressure gauge. The tank features an integrated valve to regulate output to 1,100 psi. Equipped with a foster quick release fill adapter, you'll enjoy quick and easy filling from a hand pump, aluminum scuba tank, or carbon fiber tank. Also includes buttstock and CO2 adapter. Please Note: This high-pressure tank must be filled through the male quick-disconnect on the neck. Before buying, please contact your local air supplier to see if they can fill this tank. Paintball stores may be able to fill your tank, so you may be able to find a fill source through them. Many fill sites may be able to fill your tank but may need an adaptor to do so. Please Note: This product may void the manufacturer warranty when used. Always read your airguns owner's manual before using.