NDS Dura Slope DS-224 Gray Channel Drain End Cap, Pack of 8 and stop the flow of water. The end cap should be installed at the shallowest end of a channel run. Cut to desired channel height with a hacksaw along the designated cut guides. The end cap can be inserted into the female end of the channel or secured with screws (SKU DS-123) onto the male end at points indicated on the end cap. The end cap is made of high-density polyethylene (HDPE) containing UV inhibitors. Channel drains, also known as trench drains, are long, narrow drains used for surface drainage of hardscapes. Channel drains collect and convey water to drain pipes, which carry the water downstream to discharge with a pop-up emitter, or to percolate into the ground with a dry well or infiltration trench. NDS channel and trench drains are engineered for durability, drainage, and performance.