If they have real big combs you can use a 4 inch elbow, you might have to extend it out a little more so they have to reach for it.
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What do you mean by Chuck Bit? I'm not sure that is a correct term.
I used a street elbow in mine which has two different kinds of ends. I cut off the hub end and inserted the spigot end into the bucket. Then I cleaned up the hub end and put it over the spigot end (with the elbow still attached) and pushed it tight against the bucket. The hub fits securely over the spigot holding it all together without any fasteners or glue.
Go to your local home improvement store and ask for a street elbow in 4" schedule 80 pvc-lightweight- for drainage. Cost is less than $5 in most places. I can't take pictures right now because my camera is busted. A street elbow is designed to attach two elbows together without having to put a piece of pipe in between them.