Compatible: Liftmaster/Chamberlain/Sears/Craftsman garage door openers with square rail system.
144C56 square rail idler pulley is responsible for guiding the chain or belt that raises and lowers the garage door,plays a vital role in the smooth and efficient operation of the garage door remote receiver.
144C56 Chain Cable Idler Pulley is made of high quality material with a smooth surface that minimizes friction and allows the chain or belt to move smoothly and quietly.
Turn off the power before installing this part. Easily install the idler pulley by attaching it to the square track of the garage door opener.
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