I installed this today. Haven't used it yet and will update after we do. Just thought I'd give a few insights on easier installation. The previous owner put the toilet in a very narrow slot between the shower and the wall. Not a lot of space to get around the toilet itself. This made my install a pain. Hope you have room to work.
SO: 1) Go ahead and remove the old seat, clean the area under the old attach bolts. It's usually kinda grungy. Then work on the main water supply as the seat/unit is large and blocks the view of the supply hook up. A) Close the shutoff valve that you should already have on your supply line. B) Flush the tank and remove your existing hose from the bottom of the tank.There will be some dripping. Have an old towel under this area. C) Install the new T valve to the bottom of the tank. Note that the washer in the T valve has a raised inner portion that fits INSIDE the pipe coming out of the tank. This inner portion has to be UP. If you see just a flat washer in the T valve, it is upside down. Mine came that way. Also note that the T valve has to be really snugged up against the pipe coming out of the toilet. If the pipe doesn't bottom out in the T valve and compress that washer, it's going to leak. Keep tightening it until the lower part of the T valve can be turned but not turned easily. If it leaks under the upper nut when you turn on the water supply at the end of install, it's not tight enough yet. You could, if you wanted to (because visibility is better before the seat goes on), hook up your old supply line to the bottom of the T valve now as well. I didn't but I would if I had to do it again.
2) Before you mount the seat/unit to the mounting plate, go ahead and hook up the 8mm water supply hose to the main unit. It won't hurt anything flopping off to the left side (as you face the toilet) and it's easier to see the connection and install before you mount the seat.
3) Now go ahead and install the mounting plate and then mount the seat/unit to the mounting plate. Don't completely tighten the mounting plate bolts until you have the seat aligned fore and aft. You don't want the front end hanging way out in front of the toilet or too far back over the bowl. Get it even at the front, then tighten the mounting plate bolts completely. All downhill from here. Hook your old existing supply line to the bottom of the T valve if not done earlier. Tighten. Hook up the other end of the 8mm supply hose to the middle of the T valve. Tighten. EASE the shutoff valve open s-l-o-w-l-y while watching for leaks. If you see a leak...yeah...tighten that nut.
4) Plug it in. The cord was maybe 3 inches to short to reach my outlet. Used a 3 prong extension cord.
5) You have to cover the bowl with plastic and then sit on it to check function because it has an occupied sensor. Won't work with no weight on the seat. I used Glad PressN'Seal because it stuck to the edges of the toilet really well. Overlap the seam and then cover the seam with another layer. After all this, the functions checked out perfectly. At some later time we'll give it an operation check and I'll report on that.
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