Cc NASTINESS Installation Guide Attention > [t's recommended to put a pipe joint putty on the upper gasket of the bottom assembly. This will ensure you get a good seal on the bottom of the sink. >ยป Make sure the overflow hole of the pop up drain and the overflow of your sink is completely aligned if your sink come with overflow. > [f there is any leakage, please re-assemble the drain according to the previous steps.