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The flapper valve is the internal check valve that holds a self-priming pump's prime between duty cycles by preventing liquid from draining back out of the suction line.
Always match by the MP Pumps part number 23040 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 flapper valve.