NDS 5 in. Pro Series features include 39-3/8 in. long deep profile high impact PVC channel drain with mechanical interlocking joints, structural foam polyolefin light traffic channel grate with an open surface area 20.44 sq-in/ft, 26.77 gpm/ft, UV inhibitors. Recommended for medium-duty pneumatic tire traffic, autos and light trucks less than 20 mph. End and bottom outlet fits 3 in. sewer and drain fittings end cap/knockout end and outlet fitting simplifies assembly and installation Class B create a channel as long as you need or reduce to lengths as short as 4 in. for smaller, interlocking sections. Load rating - 61 to 175 psi.