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6" Wide Polypropylene Trench Drain System with Steel Frame System for Extra Heavy Applications -  Enviro-Flo II ®
6" Wide Polypropylene Trench Drain System with Steel Frame System for Extra Heavy Applications -  Enviro-Flo II ®6" Wide Polypropylene Trench Drain System with Steel Frame System for Extra Heavy Applications -  Enviro-Flo II ®
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6" Wide Polypropylene Trench Drain System with Steel Frame System for Extra Heavy Applications - Enviro-Flo II ®

Figure Number:  9931
Extra Heavy Duty
Product Function:
Used in all surface drainage, may be assembled in any length utilizing steel frame system that is recommended for situations requiring an extra heavy duty rating to protect against hard wheel traffic, impact of steel containers, struts and metal wheels.

Contractor Friendly Features:
  • No charge precut channel inserts for protection and easy cleanup and properly sized for concrete pour.
  • Easy tongue and groove interlocking channel and end cap system. More time savings for the installer.
  • 4” integral molded bottom outlet on  every channel - labor and material savings.
  • Each side of the channel has a piece of steel embedded above the flange – this prevents any warping or bowing in the Enviro-Flo® channel.
  • Directional changes are achieved by simply cutting off the male ends which are attached together with a few provided screws.
  • Variety of grates and frames for light duty to extra heavy duty applications and pockets in the channel to provide a positive lockdown.
  • QuickLock® grate locking system makes grate assembly literally a snap.
  • Clips and hardware provided on every channel for pre-assembling the channels.
  • Polypropylene is more chemical resistant and the joint can be welded.


Regularly Furnished:
1 Meter (3.28') 100% Polypropylene Industrial Recycled Material with U.V. Inhibitors. Channel of Interlocking Design with a Built-in Slope of 0.6% with Radiused Bottom along with Steel Frame Support System and (8) Galvanized Concrete Anchors. Supplied with Secured Grate.
Related Figure Numbers
  • 9936 - Catch Basin
NameDescriptionFile Size
Specifications US Govt ComplianceItems complying with U.S. government specifications34 KBDownload
CSI Specifications for Trench DrainsCSI Specifications for Trench Drains159 KB
NameDescriptionFile Size
Assembly Guide 9931 Series FrameDetail 9931 Series Frame Assembly233 KBView
Assembly Guide for Shallow End on Trench DrainAssembly Guide for Shallow End on Trench Drain312 KBView
Install Guide (Technical) for Enviro-Flo® II Trench DrainInstall Guide (Technical) for Enviro-Flo® II Trench Drain3211 KBView
Install Guide for 9931 Load Class E Installed in AsphaltInstall Guide for 9931 Load Class E Installed in Asphalt245 KBView
Install Guide for 9931 Load Class E Installed in ConcreteInstall Guide for 9931 Load Class E Installed in Concrete259 KBView
Install Guide for 9936 Load Class E Installed in ConcreteInstall Guide for 9936 Load Class E Installed in Concrete287 KBView

Variations