InflowShield®
The Difference Is Stainless

AllClear Underground Solutions (ACUS) provides inflow reduction solutions that prevent stormwater from entering sanitary sewer systems, helping reduce SSOs and treatment costs. Our engineered products block rainwater at the manhole, improving system performance, extending infrastructure life, and supporting regulatory compliance. Explore our inflow mitigation product to strengthen proactive I&I management across your sanitary network.

InflowShield® stainless steel insert designed for inflow reduction in low-lying manhole covers
Inflowshield logo which is used for stormwater inflow


InflowShield®: Innovative Solutions for Inflow Reduction

Our InflowShield® products are designed for effective Inflow Reduction, preventing stormwater from infiltrating wastewater systems. Designed to protect your infrastructure, InflowShield ensures long-term system efficiency by addressing a common but critical issue:

  • Protects sewer manholes, which are essential for inspection, maintenance, and repair.
  • Prevents costly stormwater intrusion into sewer systems, reducing unnecessary treatment expenses.
  • Seals vulnerabilities that allow stormwater entry due to improper installation, corrosion, soil movement, or general wear.

Advanced inflow reduction technology ensures your wastewater system stays secure and efficient with InflowShield—the proven barrier against stormwater infiltration!

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InflowShield Manhole Inserts: Superior Protection for Municipalities

AllClear proudly offers InflowShield manhole inserts—the ultimate solution for municipalities looking for inflow reduction solutions and ease the burden on wastewater treatment plants. Unlike traditional plastic inserts, InflowShield delivers unmatched performance with:

  • Advanced durability—Built to last, resisting breakage, collapse, or failure.
  • Innovative design—Effectively blocks stormwater inflow, protecting your system.
  • Reliable performance—Eliminates risks of inserts falling into sewer lines.

Implementing ACUS’s Inflow Reduction solutions can lead to significant cost savings and improved infrastructure longevity

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InflowShield Cost Savings Estimator

Check the average rainfall list by state and enter your municipality’s system values in the fields below. Then click Calculate Savings to estimate your potential annual cost reduction and five-year return on investment. For more accurate results, consider the percentage of your system located in low-lying areas or zones with known I&I issues—especially where stormwater flooding frequently overwhelms manhole lids.

Results

State Precip By Inches and Hours of Rainfall
AlabamaPrecip: 55–60″ | Hours: 140–220
AlaskaPrecip: 20–25″ | Hours: 80–130
American SamoaPrecip: 120–160″ | Hours: 220–280
ArizonaPrecip: 10–15″ | Hours: 40–80
ArkansasPrecip: 50–55″ | Hours: 110–180
CaliforniaPrecip: 15–25″ | Hours: 40–100
ColoradoPrecip: 15–20″ | Hours: 60–110
ConnecticutPrecip: 45–50″ | Hours: 100–170
DelawarePrecip: 45–50″ | Hours: 100–170
District of ColumbiaPrecip: 40–45″ | Hours: 100–170
FloridaPrecip: 50–60″ | Hours: 100–150
GeorgiaPrecip: 50–55″ | Hours: 120–200
GuamPrecip: 80–100″ | Hours: 180–250
HawaiiPrecip: 63–70″ | Hours: 150–250
IdahoPrecip: 15–20″ | Hours: 70–120
IllinoisPrecip: 30–45″ | Hours: 80–150
IndianaPrecip: 35–45″ | Hours: 90–160
IowaPrecip: 30–35″ | Hours: 80–140
KansasPrecip: 25–30″ | Hours: 70–130
KentuckyPrecip: 45–50″ | Hours: 100–170
LouisianaPrecip: 55–65″ | Hours: 140–220
MainePrecip: 40–45″ | Hours: 90–160
MarylandPrecip: 40–45″ | Hours: 100–170
MassachusettsPrecip: 45–50″ | Hours: 100–170
MichiganPrecip: 30–35″ | Hours: 80–140
MinnesotaPrecip: 25–30″ | Hours: 70–130
MississippiPrecip: 55–60″ | Hours: 130–210
MissouriPrecip: 40–45″ | Hours: 90–160
MontanaPrecip: 15–20″ | Hours: 60–100
NebraskaPrecip: 20–25″ | Hours: 60–120
NevadaPrecip: 5–10″ | Hours: 30–70
New HampshirePrecip: 40–45″ | Hours: 90–160
New JerseyPrecip: 45–50″ | Hours: 100–170
New MexicoPrecip: 10–15″ | Hours: 40–80
New YorkPrecip: 40–45″ | Hours: 100–170
North CarolinaPrecip: 45–55″ | Hours: 120–200
North DakotaPrecip: 15–20″ | Hours: 60–110
Northern Mariana IslandsPrecip: 60–80″ | Hours: 200–260
OhioPrecip: 35–40″ | Hours: 90–160
OklahomaPrecip: 35–40″ | Hours: 80–140
OregonPrecip: 25–30″ | Hours: 130–220
PennsylvaniaPrecip: 40–45″ | Hours: 90–160
Puerto RicoPrecip: 60–70″ | Hours: 180–250
Rhode IslandPrecip: 45–50″ | Hours: 100–170
South CarolinaPrecip: 45–55″ | Hours: 120–200
South DakotaPrecip: 20–25″ | Hours: 60–120
TennesseePrecip: 50–55″ | Hours: 150–250
TexasPrecip: 20–55″ | Hours: 60–180
UtahPrecip: 10–15″ | Hours: 40–80
VermontPrecip: 40–45″ | Hours: 90–160
VirginiaPrecip: 40–45″ | Hours: 100–180
Virgin IslandsPrecip: 35–45″ | Hours: 120–180
WashingtonPrecip: 35–40″ | Hours: 150–250
West VirginiaPrecip: 45–50″ | Hours: 100–170
WisconsinPrecip: 30–35″ | Hours: 80–140
WyomingPrecip: 10–15″ | Hours: 40–80

InflowShield® Sizes & Specifications

InflowShield® manhole inserts are precision-engineered and custom-sized to fit common manhole rings and covers. Each unit is built from durable 18-gauge 304 stainless steel and features a machine-extruded silicone rubber gasket on the flange bottom, creating a secure, watertight seal against the manhole rim or flange.

  • Material: 18-gauge 304 stainless steel
  • Seal: Silicone rubber gasket for inflow prevention
  • Handle: 3/16″ plastic-coated stainless steel cable, fastened with stainless steel screws and locking nut
  • Available Sizes: 22”, 22.5”, 23.5”, and 25.5” diameters
  • Load Rating: Independently tested to withstand over 4,000 PSI

These inserts are designed for long-term performance in harsh underground environments, offering a reliable barrier against inflow through pick holes and lid seams.

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