I suggest a pressure test before installation. I'm not saying there's anything wrong with Tim's standpipe, just that it's better to know for sure before installation. I've bought and sold a couple of used heat exchangers and each one of them was pressure tested prior to installation.
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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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