No. An "auto drain" or "King drain" has a plunger and a spring built inside. So when the water pressure is added to the line, it pushes down on the plunger. When the zone turnes off, the spring releases the plunger and water drains out of the pipe. Usually 2-3 are installed on any given zone. http://www.kinginnovation.com/products/irrigation-products/king-drains-2/king-drains/ Good and bad issues with the drains. I install them only on manifolds or mainlines that we have to rebuild due to freezing.