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Watco Plastics Vent Valve


Richard Moore

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I found this "vent valve" behind laundry appliances in a 50's basement. It was connected to ABS drain piping and I think it was part of an upgrade that included a crappy shower stall and toilet. The configuration actually looked OK, if this was an AAV, but...

Printing on the cap included "Watco Plastics, K.C. Mo., Vent Valve" and what looks like "#P6" (maybe #P16). Google doesn't bring up anything useful. Can anyone confirm my very strong suspicion that this is a mechanical vent and not an acceptable AAV? That's my fallback report position unless anyone convinces me otherwise.

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