The RainBird 5000 series heads are the next evolution in sprinkler performance.The 5000 series are available in 4", 6" and even 12" now. Standard rubber cover for extra protection. The 5000 Plus/Plus PRS features a green cover while the 5000 features a black cover. Rain Curtain nozzles. The 5000 PLUS series features FLOW-SHUT-OFF for quick nozzle changing. The 5000 are a true 4" in height. Optional check valve holds up to 7 feet of elevation change to prevent puddling and erosion caused by low head drainage.