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Compass Marine How To | all galleries >> Welcome To >> Seacock & Thru-Hull Primer/Pre Information > Failed Brass Hose Barb
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Failed Brass Hose Barb

Please DO NOT mix cheap yellow brass with proper 85-5-5-5 marine bronze below the water line. This is the result of a home center quality yellow brass hose barb when mixed with an 85-5-5-5 marine grade bronze elbow.

Yellow brass is nearly 40% zinc 60% copper and the zinc becomes the anodic metal. Dezincification, the eating away of the zinc in the fitting, can occur rapidly and is usually identified by a pinkish coppery colored brass that should have been yellowish gold. If not caught in time the item could potentially catastrophically fail and potentially put a boat on the bottom.

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