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#1 Hoffman differential loop
above the waterline should be at least 24'' measured from the top of the differential loop down to the waterline..not sure if the old installation actually had that.. sounds like you'll be fine as long as your still covering all your wet returns appropriately..the info is from page 203 of the 1935 hoffman data book..i think the 1928 edition is in Dan's library section..post some pictures when your done..i don't get to see to many hoffman systems in my neck of the woods.
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