Polylok Residential Trench Drain & Grate - Black Grate Trench drain & grate come in 1 Metre (39.37") sections Built in bottom outlet accommodates 4" sewer drain pipe Channel lengths are interlocking, no clips required and are "Qwik Fit" Cross braced ribs are designed into the body for strength and rigidity Recommended for medium-duty pneumatic tire traffic, autos and light trucks at speeds less than 20 mph