All the forum's best tips go in. Your boiler is over 15 years old. A pipe that takes sewage and waste water from 2 or more properties. Very pleased with lifeline - the workmen came into my home with shoe covers on, went about making the repairs needed, presented the bill and left they were neat and were well dressed and made a good impression, and did a fast, complete job thank you, lifeline. Catamount plumbing & heating.