Rain Bird 1804LN Professional Pop-Up Sprinkler, Body Only No Nozzle, 4" Pop-up Height #1 commercial-grade irrigation spray head brand in the world Pre-installed orange flush cap blocks debris after flushing system; replace with any Rain Bird MPR spray nozzle 4" pop-up height Heavy-duty stainless steel spring assures flush retraction every time Patented pressure-activated co-molded wiper seal prevents wasteful water leakage and assures long life Tapered pop-up neck helps remove debris during retraction