This is a great rubber plug for any 1-7/8″ hole! Top flange is 2-1/4″ diameter and it has a large loop that makes putting it in & out easy! Body extends 1/2″ into the hole and has 2 molded rings for an excellent seal. Originally designed for use on the inside of the Southco / Orcas 2″ scupper. Works well as a sink plug, baitwell plug, or compartment drain plug! If your scupper looks like the one pictured, this is the plug you need!