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[ATTACH=full]34145[/ATTACH] One of my 4x4in enclosures has a water bottle cap in it. The other two have the round dish that came with them. Slightly larger diameter than the water bottle caps.The two small 2x2in I use the Legos. I see how the caps fit well into your enclosures. I tried round pegs in square holes and it didn't work for me .