Manhole Inserts

Manhole Inserts are a high quality uHDPE copolymer known as Marlex HXM 50100, that are fitted directly below the lid to prvent the inflow of rainfall through the cover. Each Manhole Insert is custom sized to suit each manhole providing an enhanced fit and seal.

Leaking manhole covers are a major contributor to rainfall induced inflow with studies indicating that a typical manhole casting will allow an inflow rate from .70 to over 20 Litres per minute during rainfall occurrences.