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50-year lifespan


The Stainless Steel Rainstopper is a patented manhole insert designed to eliminate inflow in your municipality’s sanitary sewer system. It also reduces the infiltration of street level contaminants, while simultaneously controlling the escape of undesirable sewage odor and minimizing traffic related manhole noise and cover displacement. The insert is manufactured in the USA to precise, custom specifications from corrosion resistant 304 or 316 stainless steel. Its unique design allows the venting of sewer gases through a non-mechanical device, reducing maintenance costs by eliminating moving parts. Weighing only 10 pounds, it can be easily installed by a single person. 


Developed to provide a 2nd layer of protection and ensure against leakage, the patented Extended Life (EL) gasket is engineered for a 50-year service life and withstands 16.5 ft of water head >1200 hours with no leaking.


Accurate frame and cover measurements are absolutely critical for the successful elimination of inflow. While carefully following the instructions included on the Rainstopper Measurement Worksheet (PDF 244 KB) measure and record the physical dimensions for each unique manhole  frame and cover. Enter the desired quality for each measurement configuration. Do not hesitate to contact us if you have questions or concerns.


Long term exposure to UV rays can deteriorate the gasket, so care should be taken to protect the stored units prior to installation. Manufacturer recommends either leaving polyethylene shrink wrapped units on pallets if stored outside or storing unpackaged units in an area protected from direct sunlight.


To install the Rainstopper, remove the manhole lid. Clean all dirt and debris from manhole frame. Seat Rainstopper in manhole frame rim. Replace manhole lid. Ensure lid is flush with frame to alleviate tripping hazard. Once installed, maintenance is not required.


Limited fifteen-year replacement warranty: If insert is defective in materials or workmanship within fifteen years of purchase, it will be replaced free of charge by Rainstopper if not damaged through mishandling, accident, or abnormal use, and excludes replacement of handle, valve, and gasket.

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