In this guide, we'll show you how to replace a Nivito kitchen sink and countertop. First, you must carefully measure the bottom of the old sink and mark the proper dimensions in pencil. Note: Be sure to not measure the top side of the sink, which is the one that lays on the kitchen counter. This side is where you'll glue down the new sink. If you don't measure properly, you'll end up with a water-damaged countertop.