Thank you for your question, Daniel! If you are not using the escutcheon, then you will need to use the single hole gasket provided, however if you are installing this model with the three hole escutcheon, even on a single hole installation, you will not use this gasket but will still need to use the three hole gasket. The information on installing this faucet as a three hole mount or single hole mount can be found on pate 3, Step 1 of the Maintenance and Installation manual below.
Best regards, Edward
Date published: 2019-01-17