UL-508 listed electric actuator. Type-57 PVC Body, PP Disc, EPDM or FKM seals, wafer style. 120 VAC capacitor run reversing type motor. Thermal overload protection with auto reset. De-clutchable manual override Visual beacon position indicator. 10 Second cycle time 1-1/2″ – 4″, 25 second cycle time 6″ and 8″ (appx.). Mechanical brake supplied as standard for 6″and 8″ Type-57. Type 4X/7 diecast aluminum w/ powdercoat finish enclosure.