22-204 Krowne 3-1/2 in Twist Waste Drain with 1-1/4 in Overflow Outlet Drain Outlet: 2" NPS Male Outer Threads1-1/2" NPT Female Inner Threads. No adapter required.3-1/2" sink opening1-1/4" Overflow Outlet with CapStainless steel strainer, flange and handleCase pack 12 piecesOptional Overflow Head and Elbow available