Quifer Actuators has a great range of manual and declutch-able gear boxes to operate quarter turn valves alon or with pneumatic actuators as a emergency device. The Declutch-able Gearboxes of Quifer Actuators are available Coditions as Standard and for Marine Version . The QUIFER Gear Operators are specifically designed to operate quarter-turn valves, as a manual override with a double acting actuator. Unless it is required in different, the declutch-able gear operators are always delivered assembled with a actuator and completely regulated.