... steelBall: brass or stainless steelStem: brass or stainless steelSituable for :1.IC card meters,heat energy meters2.Air-warm ... auto-control watersystem,industrial mini-auto equipment, Small equipment for automatic control4.Irrigation equipment,drinking water equipment,solar water ... service,hot water heating and solar glycol loop,ideal for off-grid system. Domestic/potable water,Irrigation system,cooling ...