Sewer Main Lining Boston. Sewer main lining in Boston is crucial for the aged, broken, root penetrated sewer lines. The Perma-Main™ continuous lining “Top Gun” uses air to invert the liner and steam to cure it. The “Top Gun” will perform 600+ feet of continuous sewer main lining up to 24” diameter. The Perma-Main™ liner is seamless and jointless from beginning to end. No more broken joints, root penetration or missing pipe sections with sewer main lining. If you live in the Boston area and would like to learn more about the Perma-Main™ continuous lining “Top Gun” or sewer main lining, contact us anytime.