DIG Excel™ and Microline™ driplines incorporate a simple and reliable cylindrical design with turbulent flow that includes two outlets for each emitter, a large cross section inlet filter, a large water passage, and a check valve feature used with Excel™ 1/2" (17 mm). The Microline™ with Excel™ are available in three sizes with 1/4" (4 mm), 1/2" (16 and 17 mm).