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.

Customization Options – Build Your Manhole Insert

Quick Reference: Configuration Matrix

Configure Your Perfect Inflow Solution

At Rainstopper, we understand that every municipality faces unique challenges. That’s why we offer extensive customization options, allowing you to build the exact manhole inflow protector your project needs. Mix and match materials, gaskets, handles, and security features to create your ideal configuration.

Start with Your Base Model

Choose the foundation for your custom insert:

Stainless Steel Options

Standard Stainless Steel Rainstopper: Proven reliability with flush-fit design.
Stainless Steel with Tetherlok: Built-in theft prevention and security.
50-Year Pan: Premium extended-life model with advanced gasket technology.

HDPE Option

HDPE Insert: Lightweight, cost-effective solution.

Material Selection

Stainless Steel Grade

304 Stainless Steel (Standard)

Ideal for most municipal applications.
Excellent corrosion resistance.
Proven performance across diverse environments.
Standard option, ready to ship.

316 Stainless Steel (Made to order)

Recommended for high-corrosion environments.
Superior resistance to chlorides and road salt.
Perfect for coastal regions and heavy winter-maintenance areas.
Custom configuration, please allow additional lead time.

Available on all stainless steel models.

Gasket Options

The gasket is critical to your insert’s sealing performance. Choose the right option for your needs:

Standard Neoprene Gasket

Reliable, durable, and proven for general use.
Standard choice for most municipal and industrial applications.
Expected service life: 50+ years in typical conditions.
Included with: Standard Stainless Steel Rainstopper and Stainless Steel with Tetherlok.

50-Year Gasket (Extended Life Gasket)

Rainstopper’s most advanced sealing technology.
Tested at over 16 feet of water head for 2,400+ hours with zero leakage.
Exceptional flexibility, adhesion, and durability.
Standard with 50-Year Pan.
Available as an upgrade for Standard Stainless Steel or Tetherlok models (custom order).

Ideal for:

Flood-prone or high-groundwater environments.
Municipalities requiring long-term, maintenance-free performance.
Projects demanding the highest level of sealing assurance.

Handle Options

Handles are designed for safety, strength, and one-person installation.

Woven Nylon

Non-corrosive, high-strength nylon webbing.
Designed to withstand moisture, chemicals, and heavy use.
Lightweight and easy to grip.
Standard with: Standard Stainless Steel Rainstopper and HDPE Insert.

Stainless Steel

Corrosion-resistant for long-term reliability.
Enhanced durability in harsh environments.
Standard with: Stainless Steel with Tetherlok and 50-Year Pan.
Available as an upgrade for Standard Stainless Steel Rainstopper.

Welded Handle (By request only)

Zero-failure design eliminates weak points found in riveted handles.
Maximum security and strength.
Custom configuration for specialized applications.
Available on any stainless steel model, please specify when ordering.

Not applicable to HDPE models.

Patented Relief Valve

Standar with all units

Rainstopper’s relief valve design allows the venting of sewer gases through a patented non-mechanical device, reducing maintenance costs by eliminating moving parts. Made from nitrile rubber for durability and corrosion resistance.

Key Features:

Offset placement prevents the valve from popping off during inspections or maintenance.
No mechanical parts means no corrosion, seizing, or breakage.
Long-lasting and reliable under a wide range of conditions.

Tetherlok System

The patented Tetherlok system provides unmatched assurance against theft, loss, and installation errors.

Available Configurations:

Standard with Stainless Steel Tetherlok Model: Included as the defining feature of this model.
Add-On for Standard Stainless Steel Rainstopper: Recommended for high-traffic or theft-prone areas.
Add-On for 50-Year Pan: Combines maximum longevity with maximum security.
Recommended Add-On for HDPE Insert: Offers optimal protection, reliability, and cost savings by preventing loss or downstream blockages.

Key Benefits:

Theft and loss prevention for added security and reinstallation assurance.
Prevents accidental drops and loss during inspections or maintenance.
Keeps HDPE inserts tethered and suspended to protect against downstream blockages.
Ensures reinstallation by preventing manhole covers from closing until the insert is properly reattached.
Eliminates costly retrievals that can range from hundreds to thousands of dollars.

Tetherlok System Details:

Five-foot length of 3/16″ braided stainless steel cable.
Stainless steel cable terminals and eye ends.
Cable secured to insert with stainless rivet.
Anchored to the manhole frame with a drive pin for permanent placement.

Recommended For:

High-traffic or theft-prone areas.
Systems requiring guaranteed reinstallation or field accountability.
All HDPE installations.

Learn more about Tetherlok

How to Order Your Custom Configuration

Select your base model (Stainless Steel, Stainless Steel with Tetherlok, 50-Year Pan, or HDPE).
Choose your material (304 or 316 stainless steel).
Select your gasket (Standard Neoprene or 50-Year Gasket).
Choose your handle (Nylon, Stainless Steel, or Welded).
Add the Tetherlok System if desired.
Provide accurate measurements using the Rainstopper Measurement Worksheet for precision.

Need Help Deciding?

Our team has over 50 years of hands-on experience in the water and wastewater industry. We can help you select the right configuration for your specific needs.

Ready to Build Your Custom Insert?

Let us help you configure the perfect manhole inflow protector for your municipality.

Contact Our Team for Guidance

All customization options maintain Rainstopper’s commitment to quality, precision manufacturing, and Made in the USA standards.