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If you are replacing your drop-in kitchen sink, there are a couple of methods to secure them into the countertop. Lightweight sinks like stainless steel, pressed steel or porcelain typically have clips along the bottom of the sink. Heavy sinks like cast iron sometimes can use fasteners and adhesive. The trick with cast iron is to have enough manpower to lift these behemoths into place without damaging anything.
For lightweight sinks, there is a rail underneath the sink along the perimeter. Once the sink is placed into the hole there are clips that install into this rail that extend to the countertop base. Turning the screws in these clips increases the tension on the clips and they hold the sink in place. It’s probably a good idea to run a bead of caulking or silicone under the sink to keep water from entering the sink cabinet (check with your countertop manufacturer to see which material is suitable for your countertop).
If your countertop is ceramic tile or other thick material, the clips won’t be long enough to reach the deep countertop sub base as these are thick. You first have wood (usually ¾ inch), then backer board, then finally mortar and tile. You can buy extensions for the clips or you could chop out a little of the wood sub base where the clips will mount, or even use adhesive caulking.
Once the sink is firmly in place you can connect the drain piping and finish the installation.
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