12" 570Z Series Model: 570Z Series Zero-flush seal prevents water waste at start up, allowing more heads to be installed on same line Ratcheting riser feature for easy and reliable arc adjustment Built into the riser and restricts water loss by 99% if the nozzle is removed or damaged, eliminating potential erosion or safety concerns. Allows for dry nozzle and filter-replacement or maintenance, while the system is running. Maintains constant 30 psi (2,1 Bar) psi outlet pressure, which minimizes misting and fogging caused by pressures above 30 psi (2,1 Bar). Robust retraction spring and enhanced seal material ensures positive pop-up and retraction on all 570Z models. Less visible, reducing damage from exposure or vandals.