I just installed a sink drain.
The drain has two retangular holes (about 1" by 1") in it just below the top surface of the sink and above the underside surface of the sink (above the undersink gasket)
What are the purpose of these holes? Seems like they just provide a cavity between the outersurface of the drain and the inner surface of the hole in the sink where the drain fits. Drain water must accumulate in this cavity, I would think?