... suitable for heavy pollution conditions. 5, good substitution for solenoid valve. 6, High protection class, can be worked in moistconditions. IP65 ... for 1, IC card meters, heat energy meters, air-warm valve. 2, HVAC and fire work. 3, Water equipment, uto-controlwatersystem ... machins, water heaters, industrial eletric warm valve1/2" brass full port for heating system