Equipped with Birzman's patented Air-Lock valve head, designed to prevent air loss when disconnecting from the valve. Specification Capacity: 400 psi / 27.6 bar. Gauge: 1.6 gauge with pressure release button. Head: Air-Lock threaded valve head. Barrel: CNC machined aluminium. Size: 23 x 3.6 x 4.8cm. Weight: 183g.