Laundry room vent.

[Robert Jones]

53 year old home that has obviously had some "updating". In this pic you see the washing machine drain line coming down to a "t". The run to the right goes horizontally along the crawl space floor and terminates outside the home with a "cleanout" at the top. The run to the left of the "t" goes into the drain system. Any idea what they were thinking with this setup? IF it's the stack vent, it's obviously wrong, but what else could it be?

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[Bain]

I think you nailed it, but one has to wonder why the galvanized "vent" to the right had to be replaced with PVC.

Maybe the drain to the left was the original vent, and the tee was reversed because someone grew tired of the clothes washer dumping water into the backyard.

[Jim Katen]

53 year old home that has obviously had some "updating". In this pic you see the washing machine drain line coming down to a "t". The run to the right goes horizontally along the crawl space floor and terminates outside the home with a "cleanout" at the top. The run to the left of the "t" goes into the drain system. Any idea what they were thinking with this setup? IF it's the stack vent, it's obviously wrong, but what else could it be?

Perhaps this drain clogs up frequently and they got tired of dragging the snake into the crawlspace.

[allseason]

Where's the trap?

[Jim Katen]

Where's the trap?

If it serves a washer, the trap will be above the floor, at the standpipe.