Rain Bird PH0015 Self Priming Lawn Sprinkler Irrigation Pump 1.5 HP. Built for continuous operation for lawn sprinkling and water feature applications, Rain Birds self-priming centrifugal booster pumps are perfect in applications where up to 66gpm are needed. Our pumps are 100% balanced at the factory for industry-leading quiet operation, and every pump is factory tested to ensure plumbing and electrical systems are performing correctly.