I bought the cable valve...the body is much larger than the standard valve.
The only way it will work is if I run the cable all the way over to the street side, then turn 90 degrees and head aft into the bumper compartment. (have to get over to the street side because the tank bottom is wedge-shaped, creating space under the tank.). The handle attachment is big, too..a 6" long heavy threaded bolt...needs a 5/8ths hole to mount.
The black tank is only 2" in from the bumper compartment, but there is space way over toward the street side.
For some reason, having the dump valve handle "way over there" seems odd to me. I can't put my finger on "why" this bothers me. I guess I just want to be sure before I drill a big hole.
so anyway, I have a choice: stick with the original standard valve, use an extension rod and a bracket. Or go with the cable valve handle in the trunk.
In the pic, bumper compartment is to the left; street side corner is at the top. conventional grey valve is in place; cable valve would have to be installed 180 degrees to this orientation, with the cable running parallel to the black tank.