... open signal feedback,manual override fail safe(auto-return) functionFeatures:1. Smart shape,perform reliably,brass ... ball structure,no leakage,especially suitable for heavy pollution conditions.5.Good substitution for solenoid or pneumatic valve.6. ... Service (We Sell): electric valve,motorized valve,industrial valve,manual valve,pneumaticvalve/air actuator,automatic valve,actuator,IC card water meter ...