Parson Environmental Product 21-29 in. HDPE Manhole Insert

Part #P90021

| Item #4936458

$84.00 each

Inside Diameter:

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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



  • ASTM Specifications
    ASTM D-1248 Class A
  • Application
  • Diameter
    29 in
  • Inside Diameter
    21 in
  • Material
  • Material Type
  • Product Type
    Manhole Inserts