I am installing some 2X12 vertical sungrabber panels. I've seen in some houses where it is used black pipes in the roof
and white pipes in the walls coming down to the equipment. I am guessing the black pipes are abs and the white ones
are pvc. What I can not see is if the elbows and tees in the roof are abs or just black painted pvc.
Checking in the hardware store, abs and pvc fittings have different dept, I mean, the pipe can go deeper in the pvc fittings than the abs ones. I would like to ask what should I use?