ABYC Exhaust specs.pdf ABYC Article P-1 Exhaust Systems
ABYC Marine Exhaust Standards
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I agree with you, how can black iron be good but 304 stainless not but there it is on their table of materials nevertheless. McMaster-Carr carries Sch80 SS in 316L. If nothing else you can use them for price comparison.
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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