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For replacing B8100 to the B8106s, this will convert your system from a dual flush to single flush unit, it is the stronger flush of the dual, the unit will fit inside tank as it is smaller in length for easier installation. see our link below.
Most tanks are left handed tanks however if you have a right handed tank please make sure you select the right handed option. You determine if it is a left handed or right handed by facing the tank not standing behind the tank. For customers with Gerber toilets please ensure to contact Gerber to order tank to bowl gasket. For all American Standard toilets contact American Standard for tank to bowl gaskets.