Inflow Solutions
Stainless Steel Rainstopper
Proven, long-lasting protection against manhole inflow.
Stainless Steel with Tetherlok
Added security and
theft prevention for manholes.
50-Year Pan
Premium extended-life model with 50-Year Gasket.
HDPE / Plastic Insert
Lightweight, durable,
and cost-efficient
inflow control.
HDPE With Tetherlok
Lightweight and cost-efficient plus added security.
OdorKnocker Model RX
Proven H2S odor
control for municipal manholes.
Customization Options
Configure your ideal manhole inflow
solution.
Stainless Steel Rainstopper Manhole Insert
The Foundation. Proven. Reliable.
The Stainless Steel Rainstopper is our core manhole inflow protector – the model that municipalities have trusted for decades. It delivers long-term inflow protection with proven durability, flush-fit design, and maintenance-free performance.
This is the standard configuration: stainless steel construction, neoprene gasket, nylon handle, and patented relief valve. Everything you need for dependable inflow protection, nothing you don’t.
Looking for added security? Consider the Stainless Steel with Tetherlok
Need maximum longevity? See the 50-Year Pan
Key Benefits
- Stops inflow – Prevents stormwater, runoff, and debris from entering sewer lines.
- Durable construction – Made in the USA from corrosion-resistant 304 or 316 stainless steel.
- Maintenance-free – Patented non-mechanical venting device eliminates moving parts.
- Lightweight and easy – Weighs approximately 10–14 lbs for simple, one-person installation.
- Flush-fit installation (1/8″) – Prevents plow damage and trip hazards.
- Proven reliability – Tested to withstand flood conditions (16 ft of water, 2,000+ hours, zero leaks).
- Controls odors and noise – Reduces sewage odors, traffic-related noise, and cover displacement.
Best For
- Municipalities needing long-term inflow protection with proven durability.
- Standard applications where reliable performance is the priority.
- Projects seeking quality inflow protection at the core product level.
Features
- 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.
- Standard Neoprene Gasket – Reliable, durable sealing for general use.
- Nylon Handle – Made from non-corrosive, high-strength nylon webbing designed to withstand moisture, chemicals, and heavy use.
Product Resources
- Product Specifications (PDF)
- Measurement Worksheet & Instructions
- Installation Guide
- Storage & Care Guidelines
- Warranty Information
Ready to Get Started?
Protect your system with the original stainless steel manhole inflow protector. Click the button below.
Stainless Steel Rainstopper
Configure your ideal manhole inflow solution.
Stainless Steel Rainstopper
Configure your ideal manhole inflow solution.
Stainless Steel with Tetherlok
Proven, long-lasting protection against manhole inflow.
50-Year Pan
Premium extended-life model with 50-Year Gasket.
HDPE / Plastic Insert
Lightweight, durable, and cost-efficientinflow control.
HDPE With Tetherlok
Lightweight and cost-efficient plus added security.
OdorKnocker Model RX
Proven H2S odor control for municipal manholes.
Customization Options
Configure your ideal manhole inflow solution.