Johnson Pump F7B Impeller MC97. The impeller is a very important security device. Its task is to pump the water through the cooling system of the engine. But remember that the impeller should be replaced every year. And always make sure you get a Johnson Pump Brand original impeller. Then you'll know it matches your pump exactly. 65mm Width 502 mm Impeller article number 09-1028B Neoprene (for cooling) Replaces Jabsco 17937-0001 Europe & USA Specifications for Johnson Pump 09-1028BT-1 F7B Impeller MC97: Manufacturer: Johnson Pump Color: Black Package Contents: Johnson Pump 09-1028BT-1 F7B Impeller MC97 Johnson Pump 09-1028BT-1: F7B Impeller MC97 09-1028BT-1