Part Name: Water Pump Assembly. Part Number: 3647030 3643969 4372339 4376118. Engine Model: K50 KTA50. Fitment Type: Direct Replacement. For Cummins K50 KTA50 Diesel Engine. 1pcs Water Pump Assembly. Please confirm according to the correct part number and not just the model number. Please leave your physical address (home or office address) but do not leave your P. Box address and ensure that your address and contact information are correct. Please make sure it will fit your machine before purchasing it. If you are not sure this is what you need please find out your engine model series number and contact our Customer-service. UPS Surepost usually takes 1-6 workdays. UPS Ground usually takes 1-5 workdays. If you don’t receive package over 30 business workdays, please inform us. Duty for International Buyers. We will do our best to offer you satisfied resolutions.