Thank you for your question. We do recommend to use silicone under the flange. Unfortunately, we do not provide a gasket to go between the flange and sink. Please be sure to allow the silicone to fully cure (usually 24 hrs) before running water from the faucet.
However, the included gasket should seal against the under side of the sink. If the sink is rough or uneven, you may need to use a thin bead of silicone. Please not that this pop up will only work with sinks with a depth of 1 5/8 - 2 3/8".
Date published: 2016-03-28