Brass scupper tubes question

[FLexpat]

Originally Posted by Bushwacker

If you ever get any leaks and the wood block gets wet around a stainless tube, you'll have the perfect conditions for crevice corrosion, due to moisture + lack of oxygen. The stainless might not be much better than brass in that situation!

I suspected so - thats why I was looking at passivating the stainless. After checking into it more, that is a PITA for this small of a job and nitric isn't cheap with hazmat shipping. Plan B is looking like using a fiberglass tube through the (soon to be replaced) block and a stainless tube inside of that. Redundancy works for me. Makes more work too - I don't want to finish too fast and have to start enjoying the boat. Should be easier to do since the cap is off for the transom recore.