Great thread and everyone is giving out some really good info!

I use 4" PVC couplers and deli cups for my snakes as well ... I've never had an adult girl tip one and I've got some really really big girls.

I don't glue down my couplers or fix them in place for a couple of reasons.

1. I've tried it in the past and found that it took a lot of extra time to clean the tub if feces or urates got stuck in the seam where the coupler was glued down. I try and reduces edges, corners, and seams inside my tubs for ease of cleaning. Being able to remove a dirty coupler and clean it in the sink with hot water and soap is a added benefit for the way I do things.

2. I like the idea that the snakes can move them around ... kinda gives them something to do ... or at least adds a stimuli to the enclosure ... I'll often find girls re-arrange their tubs each week and the water bowl/hides will be in the same place as the week before. Maybe they feel more comfortable having their environment a certain way?

This certainly isn't a dig at anyone that does things differently ... it's just what works for me.

Hope this helps.

-adam