Grade Rings and Grade Ring Inserts (GR, GRI)
Orenco Grade Rings are used to provide a watertight extension to the height of an existing access riser or pump basin; they consist of an Orenco Grade Ring Insert and a section of ribbed PVC riser pipe. Grade Ring Inserts can also be purchased separately.
- PVC ribbed riser material
- PVC construction on inserts for 12in and 18in nominal diameter (300mm and 450mm DN) riser pipe
- ABS construction on inserts for 21in, 24in, and 30in nominal diameter (525mm, 600mm, and 750mm DN) riser pipe