Air brake valves ("Air Brake Walls") for commercial vehicles such as trucks, buses and trailers. These valves control the flow of compressed air that applies and releases the brakes. The range shown covers a multi-circuit valve with domed caps and large threaded ports, a valve with a black ribbed silencer at its base and brass port fittings, square-flange foot brake valves with four mounting studs, and a valve with a long operating rod and linkage. All have cast silver-grey bodies with threaded air ports.