A client is adding a new bathroom and laundry room to his home. This involved running water and drainage to that area of the house. Naturally, an inspector came out to evaluate the job before giving his OK. My plumber isolated the new leg using a pipe plug which is something that I had never seen before. This allowed him to pressurize the new leg while isolating it from the old system. Once we passed the inspection he was able to depressurize the plug and remove it. See photos below.