USA Gasket seal between, sewer pipe and manhole ...
SHEET 2 0F 2 INVENTOR. JOHN D T IH R ATTORNEYS GASKET SEAL BETWEEN, SEWER PIPE AND MANHOLE OPENING The invention deals with the installation of sanitary sewers, and is particularly concerned with the problem of tightly sealing a manhole against inflow or outflow of liquid, at the points where a sewer pipe passes through its walls.