Watertight manhole insert

Details Watertight manhole insert Watertight manhole insert

E - Fixed Constructions

02

D

94/12

E02D 29/14 (2006.01)

Patent

CA 1237314

WATERTIGHT MANHOLE INSERT ABSTRACT A watertight manhole insert is provided for prevent- ing rainwater from entering a sanitary sewer system through manhole covers. The insert includes a shallow, dish-shaped body and a mounting flange designed to rest upon the supporting flange of a manhole frame. A recess is formed in the bottom of the body portion and includes a valve for releasing pressure which builds up beneath said insert. The valve is shielded such that it will not be struck by a manhole cover sliding across said insert. Additionally, the valve can be used as a handle to remove the insert from a manhole.

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