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Exhaust downtube butterfly

skelly1

Member
How necessary is the exhaust d

How necessary is the exhaust downtube butterfly on a boat? Seems like they are always disintegrated. They are reasonable enough to buy and replace but how long could they possible last and how necessary are they?
 
"they keep water from backing

"they keep water from backing up in the exhaust. (into the engine) they are not there for nothing. as long as the exhaust system is wet, they should last for years."
 
"Ayuh,..... If you're Burn

"Ayuh,..... If you're Burning them Up,.....
You've got Water Flow Problems.....

And,.....
Ayuh,... They Are Necessary......"
 
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