HDPE Flap Valves
| Size | Type | Documentation |
| 4-24" | Round HDPE Flap Valve | Drawing |
| 30" | Round HDPE Flap Valve | Drawing |
| 36" | Round HDPE Flap Valve | Drawing |
| 48" | Round HDPE Flap Valve | Drawing |
| 60" | Round HDPE Flap Valve | Drawing |
| 78" | Round HDPE Flap Valve | Drawing |
| 80" | Round HDPE Flap Valve | Drawing |
| 84" w/ 9/16" Holes | Round HDPE Flap Valve | Drawing |
| 84" | Round HDPE Flap Valve | Drawing |
| 96" w/ 1" Holes | Round HDPE Flap Valve | Drawing |
| 96" | Round HDPE Flap Valve | Drawing |