Matched flow rate nozzles to assure uniform watering patterns. 2-1/2" pop-up clearance and overall length of 4-1/2". Heavy-duty stainless steel spring for positive pop-down. Reliable, low pressure operation and has adjustable distance of throw for spacing from 6' to 15' apart. Stem cleaner keeps grit out and has an easy to remove filter screen. 1/2" Female pipe connection.