Norwesco Manhole Extension 20 InchDia. x 24 InchH

The Norwesco Manhole Extension is a 20-inch diameter by 24-inch tall steel riser that raises an existing manway collar to the height your installation needs. At roughly 15 lb empty with a 20 x 20 inch footprint, it seats onto a compatible Norwesco manhole opening to add reach for buried or recessed access points, deeper cover over an opening, or clearance where the tank sits below finished grade.

What it does and how it fits

This is an access riser, not a lid and not a storage vessel. It bridges the gap between a below-grade or low-set manway and the working surface, giving you a taller collar to land your cover on. Because manway hardware is model-matched, pair this extension with the Norwesco manhole assembly it was built to seat on rather than mixing collars across series. Confirm your manway diameter matches the 20-inch collar, and that the 24-inch height suits your actual burial depth or clearance requirement, before install.

Material note

The extension is steel, so in buried or wet-exposure service give the finish the usual attention you would any steel component below grade.

This item ships from the nearest Norwesco plant, including Griffin, GA, Hanford, CA, Sheldon, IA, Owego, NY, Tooele, UT, Washington Court House, OH, and Washougal, WA. Freight is quoted live to your ZIP through the Freight Cost Estimator, or call 866-418-1777 for help matching this extension to your tank.