Firestone Air Tank 0.25 Gallon 4in. x 6in. (2) 1/4in. NPT Ports 150 PSI Max - Black (WR17609166)This Firestone air tank provides a source of compressed air for an air spring system. Tank has 1 4 gallon capacity and (2) 1 4 in. NPT ports. Tank is enamel coated to resist corrosion, tested to be SAE J10 compliant and capable of 150 psi. Features: Provides compressed air source for an air helper spring system Allows for faster inflation of air springs Holds 1 4 gallon of compressed air Includes 1 4 in. NPT ports (2) Steel tank with brass fittings