... manual override fail safe(auto-return) functionFeatures:1. Smart shape,perform reliably,brass gear,PPO parts,large output torque, ... rubber ball seat, EPDM and NBR stem seat, NBR o-ringsBody: brass or stainless steelBall: brass or stainless steelStem: ... fire works.3.Water equipment,auto-control watersystem,industrial mini-auto equipment, Small equipment for automatic control4.Irrigation equipment ...