The Sewer Sentry System is a manhole cover gasket and ventilation solution that dramatically reduces inflow during rainstorms and lowers a sewer system’s exposure to corrosive gasses.
Sewer Sentry manhole covers are fitted with a rubber seal that helps create minimal leakage between the sewer hole cover and bearing surface. The Sewer Sentry Riser sits 5/8” above the surface of the manhole cover, venting the gasses and preventing rainwater from entering the sewer system.
Commercial grade EPDM (Ethylene Propylene Diene Monomer)
A nylon 66 resin that is:
*Also available in stainless steel
The Sewer Sentry System is an innovative, patented inflow reduction technology solution that dramatically reduces inflow during rainstorms and lowers a sewer system exposure to corrosive gasses.
The Sewer Sentry Riser is ⅝” high, so water goes around the vent hole. If the water rises higher, a ball check valve prevents the rainwater from entering the manhole. This eliminates extra electricity and water treatment costs at the pump stations, prevents storm water backups into homes and businesses, and allows harmful odors to escape.
We’ve compiled a list of the questions we get asked the most often. To jump to the section you’re most interested in, simply click on one of the tabs directly below.
Good question!
Manholes have a better chance of sucking air into the sewer system than vents on houses do because the manholes are closer to the power of the water flow and create a much stronger vacuum. (Imagine adding 50 feet of pipe to a home vacuum cleaner and the resulting dramatic loss of suction.)
Also, because gases rise to the highest level they can find, if you don’t vent manholes, you can still get gas deterioration because gases will accumulate. (Of course, manholes also need a way to stop rainwater from getting into your sewer system, which the Sewer Sentry also does.)
Yes. Due to the reduction of inflow there is less surcharge of the system during rainstorms. This deters SSO’s as well as flooding of homes and businesses.
This category of products exists because every city that gets rain has problems with inflow through manhole lids. However, we have designed the Sewer Sentry to provide some benefits not seen in other products:
The Sewer Sentry adds ⅝” height to the profile of a manhole cover.
Above-ground manholes still need to be vented to lessen corrosion due to the presence of hydrogen sulfide gas and to lengthen the life of the sewer system by letting oxygen into the pipes.
Additionally, the inflow report* by the Neenah Foundry Company shows that even a splashing rain on a 24” manhole lid with one just 1” hole lets in 4.34 GPM.
This means that a town that has 400 manholes that are raised above ground can still expect an inflow of 416,640 more gallons of water during a four hour rainstorm. A city with 2000 manholes can expect 2,082,000 more gallons.
The more storm water you stop, the less you will pay for pumping and treatment as well as repairing flooded homes and cleaning up SSOs.
* Neenah Foundry Company, “A Report on Inflow of Surface Water through Manhole Covers,” date unknown. http://www.nfco.com/municipal/engineering-literature-videos/pdf/report-inflow-brochure.pdf. Accessed April 10, 2014.
The Sewer Sentry can be equipped with a brightly colored pipe however high you want to indicate the position of the manhole and to prevent storm water from entering the Sewer Sentry’s one-inch diameter hole.
The Sewer Sentry can be equipped with a check valve system to prevent an overflow through the vent hole.
The Sewer Sentry Manhole Vent Device was independently tested for compression strength with a minimum 6000 lbs. with no cracking or deformation.***
• 3 ½” wide at top
• 2 ⅝” wide at bottom
• 2 ⅞” high
• Rises only ⅝” above manhole cover
DuPont™ Zytel® ST801-NC010A, a nylon 66 resin that is:
• highly impact resistant
• chemical resistant
• UV light resistant
• heat resistant
• cold resistant
Also available in stainless steel
Commercial grade EPDM (Ethylene Propylene Diene Monomer) blended rubber in 60 durometer (a measure of hardness).
EPDM provides superior properties for outdoor and high temperature applications:
• minimum of 1000 PSI tensile strength
• accommodates temperatures from -20 to 230 degree F
• resistant to ozone and many oxidizing chemicals and acids
• highly resistant to sunlight
60 DURO was chosen for toughness but will still have enough softness to create an effective seal.
CHEMREX® CX-948.
This high-strength glue:
• is suitable for hot and cold environments
• does not crack or lose bond
• is environmentally friendly
• cures quickly
• offers some flexibility for repositioning
Max-Gain pultruded fiberglass tube made of isophthalic polyester resin and e-glass.
This tubing is:
• UV resistant
• corrosion resistant
• flexible
• strong
Contact us directly and one of our team members will get back to you as soon as possible.
Don’t just take our word on why you should choose Sewer Sentry. See What Our Customers Have to Say About Our Combined Sewer Overflow Solutions!
Don’t just take our word on why you should choose Sewer Sentry. See What Our Customers Have to Say About Our Combined Sewer Overflow Solutions!
The Sewer Sentry System is a simple new device for manhole covers that dramatically reduces inflow during rainstorms and reduces a system’s exposure to corrosive gases.
Contact us to learn more about the Sewer Sentry System.
