- Reduces inflow
- Reduces treatment plant costs
- 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
- Operating, utility and maintenance costs for plant equipment and pumps are minimized, due to reduced flow during heavy rainfall
- The manhole inserts include 2-3/16" vent holes which release liquid at a rate of not more then 5 gallons per 24 hour period
- Each insert is equipped with a heavy-duty polypropylene strap for ease of removal and installation
- HDPE Manhole Insert 21"-29"