The 4050A Series cast aluminum closer is engineered for durability and built tough to excel in the harsh environments of high frequency, high abusive traffic areas. Featuring the most common commercial footprint, it is ideal for commercial building applications that demand a combination of quality, reliability and value. Features a cast iron body, full complement bearing, 1-1/2" diameter piston, 11/16" diameter double heat treated pinion journal. 4050A cylinders are adjustable from size 1 through size 6 and is shipped set to size 3. Closing power of 4050A Series closers may be adjusted 50 percent. Not designed for exterior mounting or exposure to the elements.