The inspector's coming at 8 AM. You've got 200 feet of new 6-inch PVC to test before final backfill. The crew's waiting. Whether your spec calls for a low-pressure air test or a hydrostatic test, you need the right plugs seated correctly and a procedure that passes the first time....

You've got a 30-foot section of 8-inch sewer main to test. The crew's ready. Do you need a blocking plug or a bypass plug? Wrong answer means either a flooded trench or a failed test. This isn't a trick question, but it trips up crews more often than it should....