There is a coupler that fits perfect and one that is close but is slightly too large, I'm not sure what you call the one that fits perfect but look around and you'll find it. I think it cost less than $2 per coupler. I put them in all my ARS-80 tubs and used silicone to glue them down. I glue all the way around the coupler to the bottom, I've only ever had one pop off, I still need to reglue it, but for now I'm using it for a small king snake that can't push it over. They even work great for my 10 pound reticulated python, she can't knock it over. I used to throw out all my dirty deli cups but I decided to keep them and wash them when I run out, works great instead of buying new cups. If you buy a case of 500 you can use new ones for a very long time before you have to wash the old ones out (depending on how many tubs you have). My ARS-70 series tubs have built in cup holders, they basically work the same. The couplers work great but are not as pretty as the built in cup holders LOL. Of course you really can't tell when the deli cup is in there and full of water.
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