This is a high pressure oil pump for the T444E International Trucks withe engine serial number from 005500 - 216543. It is manufactured by Bosch and sold on an exchange basis. This requires that the old high pressure pump core be returned. CORE CHARGE: You will not be assessed a core charge at the time of purchase. However, a core charge of $250.00 will be applied to your credit card account if the old cores are not returned within 30 days. Feel free to call our parts department at 800-891-8038 with any questions.