3820 is a flush plate for a toilet cistern, compatible with Geberit:UP720 (SIGMA 8CM) Code 109.770.00.1SIGMA 8CM Code 109.790.00.1UP320 (SIGMA 12CM) Code 109.300.00.5 - 109.330.00.5COMBIFIX Code 110.770.00.1 – 110.358.00.5DUOFIX Code 111.726.00.1 – 111.300.00.5