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We've had an ADA model Briggs vacuity, elongated seat model, for about 2 years. It occaisionally clogs. Didn't take long to figure out that a plunger doesn't work on this model because the shape of the large drain in the bowl will not allow a plunger to seal. Also, the little bit of plunging action you do get, is vented up and out of that 1" white pipe in the fill tank -- water gushed up nearly a foot above the tank! (Capping that pipe temporarily prevents the gushing).
Beside the plunger, I also tried a snake. Going in through the bowl, the snake came UP through that 1" white pipe in the tank! Yikes. Then tried going straight down that 1" pipe, but the snake got stuck without unclogging anything.
The unclogging method that has worked (so far): 1. my wife stuffs a hand towel into the 3" hole in the bowl, and applies pressure on the towel to seal that big hole shut. 2. I use compressed air to blow out the clog, with an air-gun aimed down the 1" white tube in the tank -- sealing around the air gun with flexible modeling clay. Not as easy as a plunger, but it beats uninstalling the toilet to clear the clog. The Briggs Vacuity was Consumer Report’s top rated model, but they didn’t mention the clogging issue.
I’ve also had a Gerber Ultra-Flush (model 21-318 ADA, elongated bowl model), for several years. Although the Gerber is louder, I prefer it because it never clogs, and nearly always works on the first flush. (My wife didn't want a Gerber in our bedroom bath because of the loud flush.) The flushing action takes about 3 seconds, with a few more seconds to fill the bowl -- whatever was in the bowl is swished away in a roar of pressurized water.
Briggs Vacuity, rated a best buy, Consumer Reports
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