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If there is room, another option is to cut an o-ring groove in the sealing surface of the fitting. I recently had an issue with getting a good seal on an oil pan drain plug that was tapped ever-so-slightly crooked to the sealing surface. A copper washer would not seal, but an o-ring worked perfectly with no leaks.
David
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2007 911 Turbo 6-speed, 1984 911 Carrera, 1974 911S, 75 914-6 conversion/project, 2007 Mercedes SL63 AMG, Coyote Powered FFR Cobra
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