This has happen in our area (in-wall hives)!! To add, I was so lazy, I let them (wasp) build a huge hive under the eve of my house. I then had to have a bee keeper come out an knock it down. The bee keeper came at night (He informed me night was the best time) with red flashlights strapped to their head, and a very large bee suit on. They dropped the hive in a plastic bag, collected $70 bucks, and went rolling. I have a new paper nest forming as we speak. This ones coming down tonight!!!!
To get back on topic, I?m with Dennis, I figured the KO was for the same use. Note: It may be for drainage, but that doesn?t make any sense, as they install the same ko?s in Nema type 2 enclosures.
Edit to add: Someone posted something about drainage?this is why I posted something in response-then removed their post. Can we delete post?