Denray Posted July 7, 2015 Report Share Posted July 7, 2015 S-traps above and mechanical vents below. Bogus? Toilet drain with mechanical vent. Bogus? A tub drain had a m vent too. Click to Enlarge 61.56 KB Click to Enlarge 57.99 KB Click to Enlarge 70.35 KB Quote Link to comment Share on other sites More sharing options...
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