Techs at bendix referred to item as ws2d which is a sensor mounted on wheel and generates (senses) a wheel pulse in relation to wheel speed and/or modulates air pressure accordingly. They described it as essentially a "coil around a bag with two wires to activate the brains of the brake".
NSN 5950-01-053-2755
NSN 6130-01-461-2954
NSN 5910-01-281-4718
NSN 5985-01-062-0175
NSN 2925-01-380-0869
NSN 5930-01-218-4690
NSN 5960-01-338-3412
NSN 5915-01-104-5992
NSN 5945-00-741-3711
NSN 6130-00-077-1688
NSN 5930-01-165-6178
NSN 6105-00-126-2620