The JCB 7017985 Expansion Tank is a genuine OEM component engineered to maintain the correct coolant level and pressure within the cooling system of various JCB machinery. This essential part prevents overheating and ensures efficient engine operation by accommodating coolant expansion and contraction. Manufactured from durable plastic, it provides a reliable and long-lasting solution for your JCB 3CX and 4CX backhoe loaders, as well as a wide range of Loadall telehandler models including 531-70, 535-95, 540-140, 540-70, 541-70, 550-80, and 560-80 series. Replacing an old or damaged expansion tank with this authentic JCB part restores cooling system integrity and performance, crucial for machine longevity.