NDS Mini Channel is a low cost alternative to Spee-D Channel for light duty applications. An excellent choice for residential pools, patios, spas, and tennis courts. Constructed from Polyolefin, fabricated Mini Tee with grate, Screws included. All Plastic grate and channel components are chemically resistant, rust proof, and maintenance free. It contains a UV inhibitor, with an open surface area of 11.30 square inches/foot. 14.80 GPM/foot. Grates are removable for easy clean out and replacement and are held down with NDS screws (included).