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Never---ever----pass gas again!
When I first started doing plumbing in 1971----at least for money----venting island kitchen sinks was a bit of a problem. Every plumbing fixture needs a means of venting the drain line so that water doesn’t get sucked out of the trap----which could allow sewer gases to enter the home. Somehow sewer gases and the smell of fresh baked bread or homemade pizza just don’t go together. We had to create all kinds of strange assemblies of pipes to create this venting----it worked, but was time consuming to construct and took a lot of additional pipe. Pipe and time equal money. Along came the “auto-vent” or “air-vent.” This mechanical device had a spring loaded gasket inside that would allow air to flow into the pipe but not let sewer gases out-----or, in the event of the pipes flooding, the device would not allow sewage out either. How is that for a plan? These vents could be installed right at the fixture location----saving tons of time, pipe and money. Unfortunately most jurisdictions did not allow them----except in the mobile home industry----where they are still allowed----go figure. Here is a picture of one of these vents that I found installed at ... more
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