We are converting from septic to sewer. We are trenching from the house to the street and having a contractor connect from the sewer lateral to a cleanout within the property line. We will then lay the line from that point to the cleanout close top the house. 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? The inspector was less than helpful just saying- get a plumber, but we want to do it ourselves. Hope you can give some insight. Thanks, Lynne

You can plug your line by buying a small inflatable play ground ball. Deflate the ball and slide into the pipe and reinflate.

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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