Holding Tank Valves?

Ya know the valves I installed mount over the existing valve-effectively replacing the cable with a motor-I went with these because my valves were fine-2 of my 3 cables were shot-the******they spray on the roads here in the winter destroys everything! The assembly clamps around the existing valve-think you take two of the 4 bolts out maybe, and attaches to the threaded pull that the old cable assembly connected to. The project for me was later wiring them to have multiple control stations with a pilot light to indicate position-but that's what I do! ;)