Z806Z806 6" FLO-THRU TRENCH SYSTEMZurn Z806 6" [152 mm] wide pre-sloped trench drainage system. Glass-filled polyester fiberglass drain channel with .75% bottom slope. All sections are modular 10-foot [3.05 M] lengths with interlocking ends. Complete with heavy-duty, Dura-Coated steel frame w/ anchor studs at surface, combination anchor tabs/leveling devices at appropriate locations and heavy-duty cast iron grate w/ lockdown.