.;You Can Substitute A Lever Handle Drain # 56-1376.;Which Includes The Overflow Outlet If Needed.Twist Handle Waist Drain;Sink Opening 3-1/2";Drain Outlet 2" Nps;Face Flange 4-3/8" Od;Actual Dimension Of The Top Is 4-3/8";;Current Inventory Does Not Have An Overflow Outlet.