I think the original fitting would work fine on a FWC A4 with a raw water strainer but no way on a RWC engine because of what you have experienced, rust flakes clogging up the works. Go for the Moyer style water injection fitting at a minimum and always consider FWC to prolong your engine's life.
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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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