I did learn one thing, I was wrong about bulkheads. Both sch40 and sch80 are both made from PVC, not ABS.
If you want to know more about ABS vs PVC, I know Bigshow Frags line of sumps and equipment use ABS. I am sure Darren or Dave would be happy to advise or at least provide some guidance on suggestions. @BIGSHOW They have a killer line up from what I saw at the Niagara Coral Show last year. Very sexy equipment and most likely looking that way when/if I go big again when my life gets back in order.
Check this out though
https://www.bulkreefsupply.com/bulkhead-abs-slip-x-slip-1-7c63a554c36ea63c77723a472b7ca20f.html