We just got two 4 month old rats. I have a lot of (new/unused) ABS piping around and I would like to use some in their cage. However I can not find anything online to confirm whether or not it is safe for them. I see people use PVC piping, but it is not the same as ABS. Could someone please shed some light on this subject for me please? Any information would be GREATLY appreciated. Thank you in advance!