Key Differences and Benefits

The Benefits of the Rainstopper Manhole Inflow Protector

• No minimum orders – Whether you need one insert or one thousand, we accommodate projects of any size. Every project matters.
• Lower total costs – No maintenance for the life of the product.
• Easy implementation – Simple installation with low labor requirements.
• Proven longevity – Backed by a 15-year warranty and more than 40 years of industry trust.
• Versatility – A wide array of models means there’s no manhole we can’t service.
• Full range – Available in both stainless steel and HDPE to meet every need.
• Integrity in action – Every product and interaction reflects our core values.

Real-World Challenges We Solve

Rainstopper manhole inflow inserts are designed for communities facing high-stakes wastewater challenges. Our solutions help municipalities and contractors address:

• Tight wastewater budgets – Reduce treatment and maintenance costs with proven inflow prevention.
• High SSO (Sanitary Sewer Overflow) rates – Eliminate stormwater intrusion that overwhelms collection systems.
• Safety and security risks – Prevent cover displacement, odors, and gas buildup that threaten crews and the public.
• EPA violations and compliance pressure – Maintain regulatory standards and avoid costly penalties tied to I&I.
• Corrosion and odor – Control hydrogen sulfide emissions and protect infrastructure.
• Manhole “blow-offs” during storms – Relieve pressure safely through patented, non-mechanical relief valves that prevent vacuum lock and ensure consistent access.
• Snow and surface hazards – Flush-fit stainless design protects against plow strikes and trip risks on sidewalks, parking lots, and ADA zones.
• Long-term performance needs – Corrosion-resistant materials, patented ribs, and 50-year options built for decades of reliability.

Product Options and Key Features

Rainstopper manhole inflow inserts are available in two precision-engineered designs: stainless steel and HDPE (plastic), each built for specific performance environments. Both deliver the same commitment to quality, innovation, and long-term reliability trusted by municipalities nationwide.

Stainless Steel Inserts

Rainstopper stainless steel manhole inserts are built to withstand demanding municipal environments. Each insert is manufactured from 18-gauge (1/16″) corrosion-resistant stainless steel.

Key Features:

• Flush-fit installation (1/8″) – Prevents damage from plows, wheelchairs, or foot traffic in ADA and high-traffic areas.
• Patented ribbed pan – Adds structural strength and prevents deformation under heavy loads.
• Patented Nitrile Gas Relief Plug – Non-mechanical design resists breakage and corrosion while allowing reliable venting under pressure. Offset placement minimizes accidental dislodging during maintenance.
• Welded, stainless, or nylon handle options – Secure, corrosion-resistant, and built to last.
• Tetherlok system – Patented theft and loss prevention feature that prevents inserts from falling through or being swept down the line, ensuring added security and reinstallation assurance.