• Compatible with Allister, Allstar or Larco gate or garage door opener model:
• Compatible with models ARD-II A, Access 200/250, Access 2000/2500, Access 3000/3500, PDQ, and Allister Century Series 310/510/710 garage door openers.
• Raynor Replacement Front Sprocket
• Compatible with ALL Raynor units except Flightstar units
• Replaces part number X145, idler sprocket
• This part is located on the top of the main power head
• Inner Diameter: 5/8″
  Outer Diameter: 2 5/8″

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Allstar Programming Instructions