Slotted Drain is fabricated from CONTECH Corrugated Steel Pipe. The pipe is cut along a longitudinal axis, and a trapezoidal or straight-sided grate with reinforcing spacer plates is welded in place to form a 1 3/4 -inch-wide slot opening. The slot collects runoff and channels it to the pipe below, from which it flows to the appropriate outlet. Slotted Drain is fabricated at plants throughout the United States, allowing fast delivery no matter where your project is located.