The 47-593621 was superseded by the 4759362T1 you have the one piece plastic housing look closely for signs of wear in the back of the housing and on the metal wear plate replace if necessary. If you need to replace the plastic housing you can purchase a kit that includes part #'s 2,3,4,5,6,7&8 part # for the kit is 46-807151A14 and costs around $80. I always recommend that people replace the entire housing as I said before these are prone to wear, some people chose to swap the entire pump for a brass Jabsco, but that will set you back $350-400. Impeller should cost around $20. by itself.
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