This heat exchanger for Cleveland diesel engine was fresh water to salt sea water. Pictures say a lot. It weighs 135# model HE 6420-354 replaces HE 2420-354. This item could be used for any number of heat exchanging applications. We also have 6 other very similar New Harrison exchangers HE 2120-354 Other search words to help you find us, Young Touchstone Fairbanks Morse Enterprise Nordberg EMD Commercial Sales Inc. is not a clearing house. We are a family owned Marine and Industrial Equipment and Hardware Warehouse Store in Fife Washington. We sell used, reconditioned and new old stock. We also do job shop repairs and fabrication work WARRANTY INFORMATION NO NEED FOR NEGATIVE OR NEUTRAL FEEDBACK. If there a problem, Contact us before leaving feedback. We try to be perfect but once in a while we make mistakes, but always take care of your e-mails and resolve all problems related with every part we sell. We want you completely satisfied and prefer that you contact us before leaving me any negative remarks. We try to package and ship next day but is not our only business. We may choose to reuse good boxes and be a Green seller. Money back guarantee if you are not happy with the part, you pay return shipping. View more great items