Schedule 40 or schedule 80 pipe? Also, you'll be happier in the future if you use 3/8"-16 studs with hex nuts to mount the flange. Stainless set screws work really well in this application.
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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
Last edited by ndutton; 03-31-2019 at 10:43 AM.
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