Type OA quarter turn actuators offer a very compact waterproof body with the same sturdy features of larger industrial actuators, largely dimensioned worm and quadrant output gear (naturally self-locking), ease of adjustment, precise and vibration-proof end of travel system, heavy duty motors with internal thermal protection, emergency manual handwheel, easy to read position indicator, ISO flange and removable socket permits direct or indirect mounting on any type of quarter turn valve.