The 37857R.S tensioner kit is used on the end of the rail at the door side. It keeps the belt or chain taught and prevents necessary wear and tear due to friction.
This kit Includes: Pulley, Tensioner bracket, carriage pin, pulley bracket, washer, spring, hex nut, screw, pulley guard, instructions.
Compatible Opener Models: 1028, 2028, 3020H, 3020H-B, 3024, 4024, 3022, 3042, 4022, 4042
Usually Ships In One Business Day!