The Yanmar Tractor Radiator Cap is used as a primary radiator cap replacement for many Yanmar-built compact tractors. If you are servicing or replacing your tractor radiator cap, be sure and check all of the cooling system hoses. Hoses that are hard, brittle or cracked may need to be replaced. Featuring durable construction, this radiator cap is designed to hold up for long-lasting use through many agricultural applications.