1.Widely usde in solar energy, water heater system 2.CE, ROHS, CQC FDZ-3 solenoid ... user can directly clean the filter in the water inlet of the solenoid valve.It effectively decreases ... the malfunction due to the low water quality,and thus reduces the maintenace cost of ... solar solenoid valves.With the low threshold water pressure,this products is widely applicable to the ...