In landscape sprinkler systems where there level changes water normally empties out the lowest raised sprinkler(s). During the course of a month and then a year this will add as much as lots of water that is wasted. Economical reductions may also result from excessive soil moisture, nutrient leaching and degraded look of the landscape from dead or stunted plants. These Hunter Irrigation check valves are about .00 each are simple to install. In addition, you shop for quality sprinkler bodies that have factory. Assess the specifications to ensure the check valve you’re becoming matches up with your level problems. Simple guideline, 1 feet of level change equals .5 feet of water pressure change. Favorable or negative.