Plastic Round Drainage Grates

A robust round drain with a UV inhibitor to reduce sun damage, this grate is designed with large opening slots for maximum flow while still preventing large debris from entering the drainage system. Precision engineered and manufactured to attach directly to Sewer and Drain Pipe and Fittings, Triple Wall Pipe, and Corrugated Pipe. Easy to use, installs in minutes, and blends well with the landscape. Typical application would be for direct attachment to Drainage Pipe where a catch basin is not appropriate or feasible. Available in 3", 4", and 6" diameters.


Manufactured from structurally foamed High‑Density Polyethylene (HDPE)  
UV stabilized to protect from sun degradation  
Each grate has three stepped diameters to fit Sewer and Drain (S & D) Pipe and Fittings, Triple Wall Pipe, and Corrugated Pipe  
Textured anti-skid surface   
Load rated for pedestrian traffic   
Load rated for autos and light trucks at speeds less than 20 mph   
ADA compliant 


3" Round Flat
Color: Green or Black  
Each Diameter Fits: 3" Triple Wall Pipe; 3" S & D Pipe (ASTM D2729);  3" Corrugated Pipe; 3" S & D Fittings (SDR 35)  
Open Slot Width: 3/16"  
Open Surface Area: 3 sq in  
Maximum Flow Rating: 3 GPM  
Maximum load: 500 LBS
4" Round Flat
Color: Green   
Each Diameter Fits: 4" Triple Wall Pipe; 4" S & D Pipe (ASTM D2729); 4" Corrugated Pipe; 4" S & D Fittings (SDR 35)  
Open Slot Width: 1/4"  
Open Surface Area: 5 sq in  
Maximum Flow Rating: 6 GPM  
Maximum load: 750 LBS
6" Round Flat
Color: Green or Black  
Each Diameter Fits: 6" Triple Wall Pipe; 6" S & D Pipe (ASTM D2729);  6" Corrugated Pipe; 6" S & D Fittings (DB6R1 & DB6R2)  
Open Slot Width: 5/16"  
Open Surface Area: 13 sq in  
Maximum Flow Rating: 16 GPM  
Maximum load: 1,000 LBS

Model Comparison

  • DG3RFG: 3" Round Flat Grate, Green  
  • DG3RFB: 3" Round Flat Grate, Black  
  • DG4RFG: 4" Round Flat Grate, Green  
  • DG6RFG: 6" Round Flat Grate, Green  
  • DG6RFB: 6" Round Flat Grate, Black
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