NIBCO engineers have redesigned the top works of the valve to make it easier to install and service. The stem is triple sealed with double O-rings and PTFE packing. The easily accessible, large pack nut can be tightened without removing the handle or using a special wrench. This also allows for the packing to be replaced and serviced. The handle is reversible without disconnecting the valve. 585HP ball valve features press ends for easy installation. Please refer to NIBCO technical data sheet,more valve selection guides and catalog for engineering and installation information. When performance matters, choose the NIBCO® 585HP ball valves for the most advanced and versatile valve option in commercial, residential, mechanical and industrial applications. NIBCO® ball valves are backed by the industry leading NIBCO INC. 10-year 125% limited warranty. less