Xylem-McDonnell & Miller 339500 Sa21-6,Valve Assembly .

The Xylem-McDonnell & Miller 339500 SA21-6 valve assembly is intended to regulate water flow in a variety of commercial and industrial HVAC applications, such as hot water boilers, cooling towers, and air conditioners. This replacement part for the Xylem-McDonnell & Miller 339500 pressure switch has a brass body with threaded connections, a stainless steel stem, and a bronze disc with an adjustable packing gland. The valve assembly regulates water flow, which helps to maintain proper system pressure and prevent problems like leaks and inaccurate readings. Its advantages include increased system reliability, more efficient water management, and simplified troubleshooting in the event of pressure switch malfunctions.