Installation Instructions TUSCANY 607-9678 Before you begin: Prepare counter top drilling & 1-12" diameter opening for ihe drain al desired location, Place vessel sink on Busgirl Brain Top the counter top as shown below. Best Foster Washer 1, Marks sure the vessel sink is not chipped or broken privets % installation. “, 2. Cheek to see that you have the following parts: EB Flat Waster ra ¥ Vessel sink * Pop-up drain {sold separately) installation 1.