rather than risk breaking something trying to screw big pvc
fittings together to make a cheap bulkhead, I began a quest to obtain the real thing - cheaply and easily!
i called a few plumbing stores, looking for bulkheads but no luck - one place did have 1" bulkheads, $25 each ... so that wasn't going to work either.
so I was driving around and stopped in a Marine and RV Supply store - boats have bulkheads, so I figured I might get lucky
and boy was I right!
after digging through boxes of bulkheads and bilge pumps, I came across a pair of matching 1.5" bulkheads with retaining lip and nut, and 1.5" hose barb ... how much for this great find you ask? ... hows about $2 each!
the sales person claimed the box was full of prototypes and other assorted "junk" that century boat sold them.
so now I'm set I hope ... I have to ream the holes in my overflow a bit larger to accomidate the new size but that shouldn't be too much trouble.
so if you too are insearch of bulkheads - try a boat shop ... maybe you will get luck as well!