2.5lb Nitrous BottleHigh Flow ValveBlack Powder CoatedBlow Off Valve Accessory Port2.5lb Bottle:The 2.5lb bottle is designed to fit in tight spaces and is perfect for powersports applications. The valve has a port for a NHRA blow off valve to meet NHRA regulations. Heavy Duty:This bottle is made from machined aluminum and are powder coated to maintain a quality gloss finish that will maintain a show quality shine for the life of the bottle. This bottle weighs 3.5lbs empty and 6.0 lbs full. Application:Nitrous Outlet bottles will work with any brand nitrous system. This small, light weight bottle is perfect for powersports applications.