• Filters out abrasive debris---Reduces maintenance costs.  
  • Eliminates excess flow---Eliminates motor run time spikes, Significantly reduces sewerage treatment costs.
  • Fully assembled, No special tools required---Custom sized, Installs quickly & easily.
  • High-tech polycarbonate---Outstanding impact strength, Superior dimensional stability, Resists heat & cold.
  • Molded structural ribs---Prevents dish from falling in manhole.

General Description:

The USSI Manhole Inflow Defender® Max (Inflow Dish) was designed to significantly abate rainfall "inflow" from entering the sanitary sewer system through the manhole cover and upper frame area. Inflow Defender Max™ shall withstand all gases associated with waste water collection system.

Inflow Dish Body:

The inflow body shall be manufactured from Poly-carbonate material, comply with UL Standard 94, and meet all associated ASTM specifications related to Polyc-arbonate. Dish thickness shall be a uniform 1/8" thick or greater. Inflow dish shall have a minimum debth at the 90 degrees vertical point of 3.8 inches and a minimum depth of 5 inches at the center point. Inflow dish body to be fabricated with molded ribbing members in bowl area for structural integrity. Inflow Dish to have smooth radius molded edges for additional strength and prevention of cracking.

Gasket Seal:

The gasket seal shall be made of closed cell neoprene material and have a pressure sensitive adhesive on one side for adhering to inflow dish body, seating rim. Gasket to be 1/2" wide and shall have a minimum thickness of 1/8".

Lift Strap:

The Lift Strap shall be made from a woven polypropylene material, securely adhered to the inflow dish body interior, with a corrosion resistant fastener assembly.


For proper abatement results, the inflow dish, when installed, must seat fully flush within the manhole frame rim seat area. Frame must be cleaned of all dirt and debris proir to installation.


USSI recommends clients inspect inflow dish gasket seal on an annual basis. To ensure proper abatement performance, replacement of worn or missing gaskets may be required.


One-year warranty on manhole inflow dishes standard. Manufacture date molded into Inflow Dish Body. Gasket seal not included. Replacement gasket seals are available from USSI.


The Inflow Defender Max™ Manhole Inflow Dish, shall be furnished exclusively by Utility Sealing Services Incorporated, Venice, Florida.

Ordering Criteria:

To ensure proper fit with manholes, inflow dishes are manufactured to specific measurements provided by the client. To order, please see USSI Inflow Defender® Dish Ordering Guide.

Engineering Approval:

Inflow Dish manufacturer must provide specifying engineer with their inflow dish specifications and samples for review and acceptance.

Additional Abatement Products & Technologies:

For complete information on other Waste Water Inflow abatement products and technologies, please contact USSI.