... brass gear, PPO parts, large outputtorque, long product life.2, Electrical limit and machinery limit design, accurate position,avoid ... card meters, heat energy meters, air-warm valve.2, HVAC and fire work.3, Water equipment, uto-controlwatersystem, industrial mini-autoequipment4 ... water heaters,washing machins, water heaters, industrial CWX-3 way 20mm(1/2") motorized ball 3-6V,12V,24V,for watermeter