The Norwesco 15 Inch Manhole Extension is a black polyethylene riser that raises the height of a tank manhole opening. It stacks onto the manhole collar so the lid sits higher, useful when the access point needs to be brought up to a more reachable or serviceable level. It stands 15 inches tall on a 20 x 20 inch footprint and weighs about 14 pounds.
What it fits and how it installs
Match this extension to the manhole opening on your tank rather than to tank capacity, since manhole hardware is model-matched and not interchangeable across sizes. The extension seats on the existing collar, and the original lid mounts on top. Being polyethylene, it will not rust or corrode the way a steel riser would, so it holds up to soil contact and outdoor exposure.
This extension ships from the nearest Norwesco plant in our network, with freight quoted live to your ZIP through the Freight Estimator. For fit questions or to confirm your manhole size, call 866-418-1777.
Freight and documents
LTL freight is quoted to your ZIP with the freight cost estimator or by phone at 866-418-1777. The listed price is before freight.
Technical drawing (PDF) for Norwesco 63833.
See this tank
Product video. Watch the Norwesco 15 Inch Manhole Extension video (51 seconds) with dimensions, fittings and shipping notes.
Ready to order?
Add it to your cart at the top of this page, get LTL freight to your ZIP, request a written quote, or call 866-418-1777. The listed price is before freight.
