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Old as Dirt!
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The scupper is flowing much better after using the shop vac. I didn't get anything big out of it, just some debris, so there may still be an object lodged in the hose but it is draining now.

Thank you for the idea!
You may have a colony of barnacles/oysters/mussels growing in your hose. If you can get at the through-hull and temporarily block it from the outside (without freezing yourself to death), a dose of Barnacle Buster/Rydlym or a similar descaling agent for a hour or two may be all it takes to clear your line. BTDT. It worked for us.

Good Luck!
 

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Old as Dirt!
Joined
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3,489 Posts
The discharge is just above the waterline, I wouldn't expect marine growth...but stranger things have happened. :)
Do they have mud-wasps or mud-hens where you are? That thru-hull would make a handy, dandy home for a mud-wasp to build her nest and leave her eggs. We had that difficulty with a fuel tank vent fitting that a mud-wasp completely blocked. It built it's nest right over the screening designed to keep critters out! PITA!!!
 
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