Step 4 · Apply Sealant and Position Extender
Take the flange extender and dry fit it on top of the old flange to confirm alignment. The closet bolt slots on the extender should line up with the slots on the original flange. Once confirmed, apply a continuous, generous bead of 100% silicone sealant around the entire top surface of the old flange. Carefully place the flange extender onto the sealant, pressing down firmly to create a good seal. Ensure the bolt slots remain aligned.