Disc Brake Hold Off Valve

I agree, Figure 20 of the Dodge Manual is wrong. edit. The inlet side may be correct but the outlet is was drawn in the wrong spot.

So the valve in the 68 Plymouth manual showing the Kelsey Hayes is the wrong picture?
Might have been a goof or might have been good enough for a guy doing normal service. But yea. Take a look at the picture number in the lower right corner for pressure checking and then compare it to the picture for the Bendix. Its the same picture. I like the Master Tech series because it help fills in many of the missing pieces not in the service manuals and bulletins.

Here's the '67 Plymouth Service Manual, Kelsey Hayes and then Bendix