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LiftMaster's 144B18 is an idler pulley replacement kit compatible with models ATS211 and ATS211R Garage Door Operators. Idler Pulleys provide tension to the operator belt and keeps it in place during operation. Check the manual for your specific model number before ordering.
144B18 Idler Pulley Replacement Kit
For ATS211 and ATS211R garage door openers
Provides tension to operator belt
Also known as: K144B0018, 144B0018