Thanks John, I think you are right, since the only "air space" is the upstairs commode, and the waste is being pulled up into that. The drain is located downstairs with no access to vent it through the roof. I've read these Oatey vents are designed for places like this - remodels where venting through the roof isn't possible. Since everything worked fine with a trap and a 6' vertical pipe in it — which I suspect was to let air in to avoid the problem below, I think I'm going to remove the cap, put a trap back on, a short vertical piece higher than the drain pipe, then the oatey vent. This was the same company, but not the same plumber, who did the original work. He was here to repair/replace the shower problem without tearing out the walls and did a great job. Since the original work was out of warranty, I assume he wanted to please us, save us money, was working fast, and didn't think through why it was there in the first place.
Posted by: "oakridgefarm@gmail.com" <oakridgefarm@gmail.com>
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