shcedule 40 plastic ,4.5 inches od with a wall thickness of .237" steel pipe, has the same od, but the wall thickness varies by the wt of pipe . std wt black/galv pipe is the same as schedule 40 pvc IF you use a threaded steel/sch 40pvc threaded coupling,turning the threads out should make a slip coupling. if this is what you need,and its strong enough, a sch 40 glue coupling should slide over either snuggly. problem may be putting your set screws in a pvc coupling. even though its very easy to tap, threads would strip easily. in that case,or if its a problem, a schedule 80 pvc slip coupling would have thicker sidewalls but the same id,IF you could find one of course. most normal pvc couplings will have a stop inside, if thats a problem look for whats known as a slip/repair coupling its exactly the same without the stop. hope this helps!
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