Build your custom Spee-D Channel Drainage system with the National Diversified Sales Spee-D 248 Gray Channel Drain Coupling. Use the coupling, also known as a coupler, to connect channel sections, and components such as outlets, elbows, tees, and crosses together. The Spee-D Channel Drain Coupling is made of polyvinyl chloride (PVC) treated with UV inhibitors. Spee-D Channels are part of the NDS Profile Channel series, and ideal for capturing light to moderate flows from driveways, concrete & paver patios, pool areas, courtyards, and walkways. Hassle-free limited lifetime warranty guarantees the NDS product is free from defects—or we’ll replace it.