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The building inspector says we need to place a plug at the lower cleanout and fill the pipe from above with water to test for leaks. What kind of plug is that? where can I get it and how is it placed and made water tight??
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Test plugs come in two flavors. Inflatable and Mechanical, (see images).
You place the inflatable one in the pipe and simply inflate it. The mechanical ones have a wing nut to tighten after it's been placed in the pipe. good luck with your inspection. Tom