Dayco Automatic Belt Tensioner APV2627 Full Synthetic It features a double layer

It features a double layer of engine wear protection with full zinc and Penrite's advanced Extra Ten technology

Foot Dia: 21mm

Superior allergy protection for vehicle occupants from airborne particles circulating within the vehicle that can aggravate allergy reactions or asthma

It features a lithium soap base with premium quality base oils and 3% molybdenum disulphide (moly) for added extreme pressure protection

Teeth: 211

Dayco Automatic Belt Tensioner APV2627 Full Synthetic It features a double layerDayco No Slack Automatic Belt Tensioner is designed to maintain constant tension on serpentine belt drives. The serpentine belt drives consist of a single belt that powers most, if not all, of the engine's accessories. To maintain the proper tension throughout the drive, an automatic, spring loaded tensioner is incorporated into the drive system geometry. Dayco's Automatic Belt Tensioner features a patented "flat spring" design that's engineered to