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This shim sets proper clearance or alignment between components within the pump assembly. Adding or removing shims adjusts impeller-to-volute clearance or bearing preload during a rebuild.
Always match by the MP Pumps part number 21101 listed on your equipment parts diagram, since dimensions and material vary across the MP Pumps lineup even for parts with the same common name.
Not sure this is the right part? Send us a picture of your Pump Plate to https://www.clrmarine.com/Contact-Us and the CLR Marine team will confirm the correct shim.