S. Parker, 535BCAL, Aluminum, Hydraulic Door Closer #5 Heavy Duty, Adjustable Triple Valve Back Check, For Exterior Doors Wider Than 36", 8 13/16" x 3" x 1 7/8", The Parker 500 Series Contractor Quality Door Closers, The Parker 500 door closer is the best closer to use with trimline aluminum or hollow metal doors. The closer is surface mounted and non-handed to make it simple to install and useful in a wide range of applications. It has a rack and pinion drive, and permanent all-weather hydraulics. It is non-gumming and uses separate controls for closing and latching speeds, which may be adjusted at any time. Using the same template as the Parker 950, Yale 50 and Norton 1600, the Parker 500 Series offers a universal non-corroding aluminum body for narrow stile applications. It is available in a range of finishes to suit all installations: aluminum; duranodic; black; white. The Parker 500 is UL listed, and hold-open and back-check styles are available. UL listed for hollow metal doors. The Parker 500 satisfies applicable fire codes.