Help identify ventilation part on the top of cabin

Jan 23, 2026
9
Beneteau 373 Austin
Please help me to identify how this white plastic ventilation thing is called in the top of the boats cabin? Mine is falling apart and I can't find how it is called to order new :(

Thanks!
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Jan 4, 2006
7,770
Hunter 310 West Vancouver, B.C.
And a happy belated April Fool's Day to you too. From the look of that excellent photo, I'd say it's a white toadstool which is growing out of your cabin roof.

Barring that, it could be a cowl as shown here :

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The SS is a little more pricey but the vinyl ones don't last more than a few years.
 
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Jan 4, 2006
7,770
Hunter 310 West Vancouver, B.C.
Now we're off in a whole new direction :

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What you're showing is simply a vent with a weather cover. It allows stale air to be released from the cabin below it.

A cowl uses the kinetic energy of the wind to force air down into the cabin below. Two different devices for two different uses. Your call.
 
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jssailem

SBO Weather and Forecasting Forum Jim & John
Oct 22, 2014
24,753
CAL 35 Cruiser #21 moored EVERETT WA
It is a dorade. It may be one of these.

Marine Town Dorade Dome Vent 175370. Marine Town Dorade Dome Vent 175370

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or may be one of these I posted about in 2021. They are a popular dorade in the Mediterranean.
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