Review on Gerber 99-647 PowerTool by Robert Lemons

Gerber toilets have a handy model number marking for replacement flaps on the inside of the water tank. Mine was marked Gerber 99-647. When I went to Revain to order this part, 3 out of 7 customer reviews said it didn't work. I ordered it anyway, installed it in less than 5 minutes and it works great. I am ordering a second Gerber 99-647 muffler from Revain as I have a second Gerber toilet of the same model and age that will need a muffler replacement at some point.