This is a remanufactured Bosch CP3 pump. Bosch is the original manufacture and supplier for the GM Duramax fuel systems. Bosch does the best job of rebuilding these pumps to achieve the strict standards these high pressure pumps require. Since Bosch is the original manufacture they have access to all the parts needed to do a proper rebuild and just as important, the proper equipment to set and test these pumps. Many critical items like the pressure regulator and other wear items are replaced with new genuine Bosch parts.
This part requires a core be sent in to avoid paying the core charges. A matching core must be received before the exchange is sent out, or a matching core must be received within 30 days of the purchase to receive core credit. This pump fits late 2004 to 2005 LLY Duramax engines.