If you have one of the older Russwin 2800, 2810 or 2820 door closers, you will have to replace it with a Corbin Russwin DC3210 for interior doors, or the Corbin Russwin DC6210 for exterior doors. Both the DC3210 and DC6210 will match the hole spacing of the Russwin 2800, 2810 and 2820 door closers, so you will not have to redrill holes. Your current door closer is probably marked SL72, Clarksdale, MS.
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