Denray Posted September 15, 2015 Report Share Posted September 15, 2015 Any reason for a P-trap, minus a vent, mid way down a long drain run? No sink upstream, just a clean out. Good luck with that. Click to Enlarge 62.7 KB Quote Link to comment Share on other sites More sharing options...
kurt Posted September 16, 2015 Report Share Posted September 16, 2015 Looks like a house/building trap. What diameter is the pipe? Is it the main sewer out of the building? Quote Link to comment Share on other sites More sharing options...
Denray Posted September 16, 2015 Author Report Share Posted September 16, 2015 Seems like it was 3 inch. It goes about 8 feet back behind me to the exterior wall. It travels down to a much larger drain. Quote Link to comment Share on other sites More sharing options...
kurt Posted September 16, 2015 Report Share Posted September 16, 2015 If it drains to the exterior wall (can't tell from the pic which way it's pitched), it's probably an old building trap. We don't have them around here, don't know what California does with them. Quote Link to comment Share on other sites More sharing options...
Denray Posted September 16, 2015 Author Report Share Posted September 16, 2015 It's draining away from me towards middle of house. Weird. Quote Link to comment Share on other sites More sharing options...
kurt Posted September 16, 2015 Report Share Posted September 16, 2015 Where's the sewer exit? Is it in the middle of the house? Could be, if it is, I'm sticking with building trap. Just a WAG.... Quote Link to comment Share on other sites More sharing options...
John Kogel Posted September 16, 2015 Report Share Posted September 16, 2015 If it's unusual, it is usually wrong. There's no easy way to clean the rust and sludge out of it. Quote Link to comment Share on other sites More sharing options...
Denray Posted September 16, 2015 Author Report Share Posted September 16, 2015 Yep, I've seen vents way far away from a shower P-trap, or not at all, but never a P-trap out in the middle of nowhere with no fixture above it. Well, maybe one other time. Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted September 16, 2015 Report Share Posted September 16, 2015 It didn't always do nothing. Something changed. Quote Link to comment Share on other sites More sharing options...
Jim Baird Posted September 17, 2015 Report Share Posted September 17, 2015 ...I once inspected a group home under construction where the plumber had installed a "master trap" with two cleanouts before and after trap. It is related to commercial rqmnt for grease traps and separation of soil drain from kitchen drain. Technically I think it was not necessary in what is called a "six-pack" (six or fewer in group home setting where manager is POA for old folks w/o family or insurance). In the current setting it was overkill. Quote Link to comment Share on other sites More sharing options...
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