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Here's an annotated drawing. Your loop is located as high as possible in the galley cabinet next to the sink (pictured). It may have a small valve that automatically lets in air on the top or instead of a valve it may have a small hose that eventually goes to a thru-hull. In time the valve may fail by being stuck or clogged. The hose type has no moving parts.
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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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