Having all the parts handy can make a challenging job easier. Changing an impeller can be straight forward or it can be a bear. Either way having all the parts you need will help speed up the process and perhaps make the job a little easier. Sierra packages impeller kits to save you time; all of the research and sourcing of individual parts has been done. Each impeller, impeller gasket, washer gasket and O-ring in the kit is engineered to meet or exceed manufacturers specifications. We recommend having a spare impeller (Sierra p/n 18-3057) for unexpected failures caused by debris or clogged intakes. Key Features Engineered to meet or exceed OEM specifications Kit includes impeller, impeller gaskets, impeller washer gasket and O-rings Fits many Mercury 25hp outboards 1988—2004 18-3215D Application Guide ApplicationOEM Part NumberGLM12107Mercury Marine47-85089T7, 47-85089Q4The Sierra Engine Parts SelectorIn addition to impeller kits, we offer a wide variety of other engine parts manufactured by Sierra. To see if we have the part you need, see ourEngine Parts Selector, where you can search by engine make, serial number and model or year of manufacture.