POP-UP SINK DRAIN WITH OVERFLOW KNOCK-OUT BLANK

A drain body used to connect a sink drain to drainage pipes for use with sinks having integral overflow protection and sinks with conventional overflow ports. The drain body comprises a hollow cylinder with an upper flange including an upper sidewall portion defining a knock out blank which may be left in place or may be easily removed, thus providing a hole through which the overflow water which is carried through an integral tunnel in the sidewall routed to the bottom drain port of the drain body sinks versus a conventional overflow port. Because sinks having no integral tunnel for draining overflow water require a solid drain body, the user would simply leave the upper sidewall portion intact in order to use the drain with overflow knock-out blank drain body.