Zurn Z812 12" wide pre-sloped trench drainage system. Glass-filled polyester fiberglass drain channel with 1/8" per foot bottom slope. All sections are modular 10-foot lengths with interlocking ends. Complete with heavy-duty Dura-coated steel frame with anchor studs at surface, combination anchor tabs/leveling devices at appropriate locations and extra heavy-duty ductile iron grate class C with lockdowns.