I am going to make some of these for ant prevention:
https://picasaweb.google.com/MichaelJShantz/BeeHive4302010#5601072462012353570
I am actually going to try 2 inch PVC end caps to save gluing a 2" pipe to the acrylic as shown, with one inch PVC pipe as the support. I have tons of old CDs and DVDs that are obsolete with the cloud to use a roof to deter bee entry, and keep any water out. I will probably drill a one inch hole in the CD “roof” for sucking out old and ants and replacing with new. The hole could be rotated under the hive most of the time to prevent rain entry (not that we get much rain, or even enough rain!). Might even see if I can get 3" end caps, to make things a little easier to fill and drain.
Dawn