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Tom,

I had to replace pilings for a friends dock 20 years ago. The wood pilings were just getting demolished by worms.We decided to install 20 foot lengths of 8" and 10" schedule 40 as the pilings. They have been submerge in a salt water environment ever since. They have not been touch by UV rays, water, ice or any marine creatures, Oh and they don't harm the ecosytem like treated pilings do. I have every confidence in my new PVC thru hulls.

Norm