Water-LOK Grade Ring Liner

Tru-Contour Secondary Invert System Water-LOK is a telescopic liner system that protects the grade work area from water infiltration as well as chemical attack. The self adjustability of the system allows it to compensate for grade movement after initial installation.


Water-LOK can be used in both new and rehabilitation projects and is compatible with all mechanical means for securing castings to structures. Inflow & Infiltration deterioration of grade work is one of the leading causes of pothole formation around manholes. Grade work is constantly being attacked by the pounding and vibration of traffic, the corrosive effect of chemicals produced by bacteria found in sewer systems, and the freeze/thaw cycle. These forces destroy the grade work by creating voids that eventually turn into potholes. Available sizes in stock include 24'' and 30''.