Brake proportioning valve bleeder tool, compatible with non-adjustable GM style combination valves, 172-1353, 172-1371, Disc/Disc and Disc/Drum PV2 PV4.
The blue color looks metallic and distinctly obvious.
Help you to lock the low pressure exhaust valve, make braking system bleeding more easy and fast, avoid the valve from tripping.Just twist off your brake light warning switch on the valve, then screw this tool into its place easily.
Made from aluminum alloy, lightweight and durable, specially designed for bleeding brakes.