Part Name: Aftercooler Oil Cooler. Engine Model: NT855 NTA855. For Cummins NT855 NTA855 Diesel Engine Parts. 1pcs Aftercooler Oil Cooler. 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 inCompatible withmation are correct. Please make sure it will fit your machine beCompatible withe 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.