Product review (5 stars): Gerber toilet fix
This kit solved my Gerber toilet leaks.  I tried most every kit at Lowe's and Home Depot with no luck fixing the leak from the tank.  This rubber gasket is about 1/4 inch thicker than the other 4 that I purchased and installed  to no avail.  Gerber designed their toilets to need a special size gasket and this is the Gerber produced gasket.