The 37857R.S Genie 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 with Genie openers: IntelliG 1000, 1200, 4024, 4024H, 3024, 3024H
Compatible with Genie openers: SlientMax 1000, 1200, 3042, 4042