Power adjustable overhead door closer. Size 2-4. Surface mounted. For single action doors. Successfully type-tested for conformity to all the requirements of BS EN 1154. 180¦ opening angle. Universal fitting - 1 regular, 61 transom and 66 parallel arm mount. Left or right handed doors - in or out opening. Independent adjustable sweep, latch & backcheck valves. Power show adjusts strength by 15% up/down. Silver.