Gerber 99-591 Tank To Bowl Gasket
The gasket goes between the porcelain tank and porcelain bowl.
Genuine Gerber 99-591 tank to bow gasket. This gasket is for pressure assist toilets. This is the gasket that is contained in kit 99-539. this gasket is about 3 3/4″ wide, and about 1 1/8″ thick. Other part numbers are G0099591, 0099591, 99591.