Rainbird Uni-Spray Series Pop-Up Spray Head Body 12 Van, 4" 4 in. pop up spray with 12-VAN nozzle 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