Exhaust manifold gasket

[Hhibrian]

What is the expected life of exhaust manifold gaskets in salt water?

 

[Jerryjerry05]

Exhaust manifold on WHAT???
Usually they can last as long as the manifold.Manifolds can last 10-20 yrs.
You take them off and on they will last considerabley less.
Profile?

 

[1stboat]

You take them off and on they will last considerabley less.

Really, why is that?