Phoenix Precast maintains an inventory of precast grade rings in the following diameters: 24”, 30” and 36”. These products are manufactured in increments of 6” and range in heights of 60” (depending upon the diameter). We also have an assortment of “open throats” for the top of your stormwater drainage structures in various configurations.
HDPE Pipe Collars
Grade Rings
24in Diameter HS-20 Adjustment Rings | DWG | |
30in Diameter HS-20 Adjustment Rings | DWG | |
36in Diameter HS-20 Adjustment Rings | DWG | |
Grade Ring 24 Square | DWG | |
Grade Ring 24In Diameter | DWG | |
Grade Ring 30In Diameter | DWG | |
Grade Ring 36In Diameter | DWG | |
Worcester Std Grade Ring 30 x 36 | DWG |