The 1800 Series has first-rate quality built in for reliable operation and long life. Their great components and features make them the spray heads of choice for a wide variety of applications. Heavy-duty stainless steel spring assures flush retraction every time. 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 to remove debris during retraction. Dual orifices eliminate gaps close to the spray. Minimizes dry, brown spots. Great coverage uniformity helps to reduce run time up to 35% to conserve water. Precision controlled flush at pop-down clears debris from unit, assuring positive stem retraction in all soil types. Exclusive co-molded wiper seal features an encased plastic "cage" to provide unmatched resistance to grit, pressure and the environment. Pressure-activated, multi-function seal design assures a positive seal without excess "flow-by", which enables more heads to be installed on the same valve.