The measurement from the middle of the drain hole to the back of the vessel?
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Hi RayPat! The center of the drain hole to the back of the sink (outer side) is 3 3/4" Please let us know if you have any other questions or concerns by calling 1-866-591-7792 option 2 or send an email to sf@vigoindustries.com. We are open from Monday-Friday, 8am - 5:30pm EST. Regards, Everyday Interiors
