Looking for a replacement water pump for your Duramax? The ACDelco professional water pump circulates coolant through the radiator and engine system to help maintain proper engine temperature and performance. The gasket and O-rings packaged with this water pump help guarantee that all necessary parts are available for trouble-free installation on your LB7 / LLY Duramax. Manufactured to GM OE specification for fit, form, and function. Offering the quality, reliability, and durability of GM OE. GM-recommended replacement part for your GM vehicle's original factory component. Thoroughly tested for reliable, leak-free performance. LBZ / LMM / LML. To the lower 48 US states. Thanks for looking, be sure to check out our other items!