Compact size fits easily in the wheel area. Universal rubber fitting holds securely on brake bleed screw Internal overfill valve prevents rental brake fluid spray if container reaches capacity Clear drain hose provides visible inspection of old fluid during bleeding with on-off switch prevents spills when not in use 18.5 fl. oz. (500 ml) container equipped with overfill check valve. Vacuum: 24 in. Hg at 100 psi Requires an air compressor.  We also rent air comprssor equipment.