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A trapezoidal or straight-sided grate with reinforcing spacer plates is welded in place to form a 1 3/4″-wide slot opening which collects runoff and channels it to the pipe below to form a continuous grate inlet.Welcome to. Slotted Drain Pipe is fabricated by welding a narrow section of grating in a continuous slot cut in the top of a corrugated steel pipe. It also is widely used in parking lots and similar locations to remove sheet flow without complex multiple grades, catch basins, or water channeling devices. Slotted Drain Pipe is a practical, aesthetically pleasing drainage inlet product for the efficient removal of surface water and sheet flow on streets and highways.

Western Corrugated Steel Pipe Association (WCSPA).

Southeastern Corrugated Steel Pipe Association (SECSPA).

Great Lakes Corrugated Steel Pipe Association (GLCSPA).

NCSPA Education & Research Institute (NERI).

8 slot yellow corrugated drain pipe