You need 5 ply marine exaust hose...
Check this web site for distributors in your area;
Buck Algonquin...Quality Marine Harware Since 1955
Do NOT use anything else. This is one area you do not want to cut corners. 
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A man who is not afraid of the sea will soon be
drowned, he said, for he will be going out on a
day he shouldn’t. But we do be afraid of the sea,
and we do only be drownded now and again.
-J.M. Synge, in The Aran Islands
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