[These Threaded Seals DO NOT fit the EarthMinded RainStation Rain Barrel!]
In order to install a drain fitting from the outside of the barrel, this threaded rubber gasket is used. As you screw in any .75" fitting it will expand to provide water tight seal. Hole size is 1.25"
The Threaded Seal is connected between the drain assembly and the barrel at position #3 and #4 in the drawing below.