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6.With the three Pop rivets in place, the Flow Kooler disc will be held firmly in position. Re-install the back cover of the water pump using a new gasket (GM PN 10204452), and you're finished. With the disc in place, the upgrade will prevent water from leaking past the impeller blades, which limits the performance of the pump. The disc increases water circulation and prevents water from cavitating within the pump housing, enhancing engine cooling--all for about five dollars. The discs are available for a wide variety of applications including GM, Ford and Mopar vehicles.