I had two iVac gates, one 4 inch and one six inch. All my other gates were stock Nordfab (Several fours and sixes). I put the Grit Gate Controls (which are solenoids, I believe) on the stock Nordfab gates. I also replaced the iVac gates with Grit Gate Control modified Nordfabs. Each gate can be converted to the Grit Gate Control in a few minutes. Wiring them is pretty easy as you daisy chain them via thermostat wire to a common 9V Grit Power Bank. I ended up with 3 'circuits' to minimize power drop.
I did have one Nordfab gate that was sticky. It didn't open and close like the others. This one also happened to be new. GRIT instructs you to lightly file the edges and I gave them a coat of dry bike lubricant and it worked perfectly.
