This is just the top of Standard’s Lavatory pop-up drain. This is one of the two parts that get cut off when someone tries to repair their leaking drain. The reason? Standard made the locknut under the sink out of Zinc, and once Zinc gets wet, it welds itself to this part. They are nearly impossible to get apart when servicing these sinks. Not anymore! Ours are made of Chrome plated brass, so the sink will last for many more years. This drain top is 2 3/4” tall, and the flange is 2 1/8” wide. Yes, the 65-1200 stoppers do fit.