Proportioning Valve

I guess I'm confused... the first picture is what is what is on my car might below the master, in the engine bay. I thought this was the proportioning valve.

This link pulled when doing a search. http://www.ebay.com/itm/Disc-Brake-Proportioning-Valve-MOPAR-Dart-Duster-Demon-Cuda-/331037012773

Looks the same...? What am I missing.