The Large Monitoring Well Manhole allows access to monitoring/observation wells. The manhole is large enough to accommodate most electronic probes, conduit and junction boxes. The manhole features a steel ring, diamond plate steel cover with a monitoring well triangle designation in the center, galvanized steel skirt, 3/8″ flush mount stainless steel bolts for limited access and carries the H-20 load rating. The Model 106MW is a limited access monitoring well manhole and the Model 107MW is a rain tight limited access monitoring well manhole which includes a Buna-N gasket.