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Yale 3300 Door Closer

• Adjustable spring sizes 1 thru 6
• Rack-and-pinion design
• 1-1/4" (32mm) diameter piston
• 5/8" (16mm) diameter pinion journals
• Cast aluminum body
• Standard, separate and independent, latch,
  sweep and backcheck intensity valves
• Staked valves
• Molded plastic cover standard

This door closer replaces the older 3301BF closers. The new version is Barrier Free Complaint.
3/4" x 12" hole spacing, the cylinder is sometimes cast 20-3301-1001 on the back of the cast aluminum
cylinder.

Yale 50 Series Door Closer

• ANSI A156.4, Grade 1
• 10-year warranty
• Non-handed
• Rack-and-pinion design
• Cast aluminum body
• 1-3/8" (35mm) diameter piston
• 5/8" (16mm) diameter pinion journals
• Standard, separate and independent, latch, sweep
  and backcheck intensity valves
• 2-7/8" (73mm) projection
• Tri-Packed- packed for regular arm, top jamb and
  parallel arm installations.
• All standard arm applications allow

Older models may be stamped with Scoville or Eaton, which are the companies that used to own Norton
We some times find 20-0054-4001 or 20-0254-4001 stamped on the back of the closer