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Assembled device that applies load to the drive belt. 89441 by Dayco As the major supplier to heavy duty original equipment manufacturers this Dayco r No Slack r Heavy Duty Tensioner is guaranteed to be engineered and manufactured to the strictest design specifications. The heavy-duty cast aluminum body and pulley arms translate into extra strength and durability. This Dayco r Heavy Duty r Tensioner features a patented A a flat springA a _ design that s engineered to handle the higher torque and power pulses exerted by today s diesel engines. Rugged pulleys with double lifetime lubricated bearings deliver long lasting dependable service. In addition this Dayco r Heavy Duty Tensioner features an A a extremely dampedA a _ design using a wave spring and a metal ring with a bonded rubber surface to act as a A a radial shock absorberA a _ for the tensioner arm.