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The Universal manifold you pictured requires Welch rather than cup style core plugs. Cup style is for a smooth bore hole and its plug is a tight friction fit. Welch plugs are for a core hole with a limiting shelf (visible in the picture), are a looser fit with the convex side out and then are struck with a ball peen hammer to expand/set them in place. An installed Welch plug typically has a dimple in its center from the striking operation.
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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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