It's time to get this adjustable proportioning valve in. I can't seem to locate a place I'm happy with. Well, I have but the hose/fitting size it different than the fittings supplied. Close to the middle of the truck is a nice splice that would be perfect. I would only have to unbolt the female coupler and bolt in the prop valve in the couplers place. Problem is the hose back there is, I think 1/4". The fittings on the prop. valve are the standard size, I think 3/16". I'm not sure! If I knew what size fittings they were my life would be much easier. The brake line fitting that bolts into the rear drums thread into the prop. valve fitting, if that helps. Where did you install your proportioning valve and which adapters did you have to use?