... ball structure, no leakage, especially suitable for heavy pollution conditions. 5, good substitution for solenoid valve. 6, High protection ... for 1, IC card meters, heat energy meters, air-warm valve. 2, HVAC and fire work. 3, Water equipment, uto-controlwatersystem, industrial ... , solar water heaters, washing machins, water heaters, industrial eletric warm valve1/2" brass full port for heating system