Concrete pipes are much more robust than flexible pipe, with inherent strength that means they are less reliant on installation to provide support. They are also long-lived, with many manufacturers advising between 100 and 120 years design life. Flexible pipes may have a lower initial cost, but concrete pipes will always be the most cost-effective solution in the long term.
Manhole Rings allow us to build and maintain the modern sewers that most of us so easily take for granted. Concrete manhole rings provide a secure structure to shield against the inward pressure of the surrounding earth.