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i have an 86 v20 cudy with bow rails. the t fitting have disintegrated but the tubing looks very good. i am thinking that the tube is stainless and fittings aluminum. how do you tell if tube is stainless or aluminum any help appreciated
here are some pictures looks like the 60 deg. t's are alum and rest is stainles.

Actually it depends on the grade of stainless.
For better strength and to be less brittle there needs to be some amount of carbon present in stainless.
Stick a magnet to stainless and there will be some attraction but not usually enough to hold the weight of the item.
Had a buddy of mine gripe about some stainless rusting on his boat. Told him "stainless means it will stain less, not that it won't rust".