Rainbird Uni-Spray Series Pop-Up Spray Head Body, 4" 4 in. pop up spray (nozzle not included) Pressure-activated, wiper seal prevents excessive flow-by and water waste. Keeps debris from entering upon retraction Durable stem ratchet allows for quick and easy nozzle pattern alignment Internal parts removable from the top of the sprinkler for easy servicing Small exposed cover makes the unit virtually invisible for more attractive landscapes