Could some please tell me the sizes I'll be needing?
Drill bit size?
Bulk head sizes?
Hard pipe size?
T size?
Cap size?
I'm using BRS Schedule 80 fittings if this helps. My internal overflow box measures 5 1/4" L x 3 5/8" W x 5 1/4"H
I'm also thinking 1 1/2" overflow is big no?

I'm double checking with you guys on what I've been told to order by my friend here. I already had to change my baffles because he said 3/4" glass and I thought that was to thick so I ordered 1/4" instead.