This Pro Series channel drain kit features an interlocking design which allows each unit to securely lock to the next for a secure, tight fit. The kit comes with the grate pre-installed on the channel. Channel sections connect with interlocking joints; bottom outlet connects to 3 in. & 4 in. Sewer and Drain Fittings; side outlets to 3 in. Sewer and Drain Pipe; end outlet to 3 in. Sewer and Drain Pipe & 4 in. Sewer and Drain Fittings. 72 GPM per ft. flow rate. 23.5 sq. in. per linear ft. open surface area. Rated for NDS Class B Loads (up to 175 psi) when properly installed-recommended for medium-duty pneumatic tire traffic, autos and light trucks at speeds less than 20 mph; ADA compliant