The first thing I would do is measure the thickness of the new impeller and the depth of the impeller cavity in the pump. Make sure the impeller is slightly larger than the cavity depth. A tape measure isn't accurate enough, must use a caliper.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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