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LiftMaster Chain Tensioner 1 1/4" | LIF-71-6125 Ritron RQX Programming Kit LiftMaster Field Modification Chain SashLiftMaster Chain Tensioner 1 1 4" LIF 71 6125 The LiftMaster Chain Tensioner is a genuine replacement part designed to maintain the optimal tension of the drive chain in your commercial door or gate operator. Proper chain tension is crucial for smooth and reliable operation, preventing chain sag, slippage, and premature wear on sprockets and other components. Genuine LiftMaster replacement part.