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post #1 of Old 04-07-2012 Thread Starter
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Sewage Line

I am replacing the original sewage lines in my Columbia and found this bronze elbow in the area behind the toilet. The sewage line goes up from the toilet to this elbow and then down to the sewage tank. At the top of the elbow there is this plastic screw in plug with a very small serated tip on the outside for a tube to attach to and a flap type end on the inside as per pictures. Can someone tell me what this is. When I removed it, it was completely plugged so I assume it wasn't working. Is this some kind of a vacuum relief valve. Any ideas. Thanks
Attached Images
File Type: jpg boat sewer elbow.jpg (63.1 KB, 13 views)
File Type: jpg boat sewer elbow2.jpg (61.1 KB, 11 views)
File Type: jpg boat sewer elbow3.jpg (62.8 KB, 13 views)
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