Just as well, from what I was able to find, ABS is not intended for contact with food or water we consume. In the past it was used for waste lines, but in recent years it has become prohibitted (in many areas) in new construction. I am a safety person by profession, and ABS doesn't sound too good. It contains acrylonitrile which is a highly carcinogenic, teratogenic chemical. It maybe completely bound up in the polymer, but I certainly wouldn't put it in an aquarium.