Doing an Edgestar Mod?

Yes from inside. I used the existing punch out from the factory just above the exterior drain hole. I pushed an ice pick through and found just insulation and plastic interior liner. I pushed through the liner to mark the hole and drilled from the interior out. Very easy. I used a 7mm cap nut/Teflon tape on the threads and an o-ring to seal exterior drain. I used the rubber plug to seal the interior drain.