Product Details

• Reduces inflow
• Reduces treatment plant costs
• Includes valves for gas and vacuum relief
• These manhole inserts are manufactured from HDPE and will not rust or corrode
• They have been proven effective in reducing or preventing surface water in flow to the collection system, through the manhole lid
• The valves are spring loaded and designed to release at 2 psi for vacuum and 1 psi for gas
• HDPE Plus inserts also include a polyethylene gasket for sealing to the manhole frame
• The insert will allow a rate of not more then 1 gallons per 24 hour period
• Each insert is equipped with a heavy-duty polypropylene strap for ease of removal and installation
• Custom manufactured dimensions required