Holland Greenhouse Riser Spike Eco Sprinkler, 36inWater efficient eco sprinkler uses up to 1 3 less water than conventional sprinklers. Unique sprinkler head is designed to break the water droplets to create a fine mist for better water absorption and increase oxygenation. Will not damage small plants or seedlings. Coverage up to 1900 sq. ft. at high pressure. Can operate on low water pressure (5 80 psi).