NBR NTA-0H020 is a drive belt tensioner assembly for selected Toyota, Lexus, Scion and Pontiac vehicles. It is designed for the accessory / V-ribbed belt drive system and helps maintain proper belt tension for stable operation of the alternator, water pump, air conditioning compressor and other auxiliary units. Cross references include Toyota / Lexus 16620-0H020, 16620-0H021, 16620-28040, 16620-28041, General Motors 19185399 and Masuma MIP-1041. Compatible with selected 1AZ-FE, 1AZ-FSE and 2AZ-FE applications depending on model, production year and market. Verify the original part number or VIN before ordering.