Welcome to Plbg.com
Thank you to all the plumbing professionals who offer their advice and expertise

Over 698,000 strictly plumbing related posts

Plumbing education, information, advice, help and suggestions are provided by some of the most experienced plumbers who wish to "give back" to society. Since 1996 we have been the best online (strictly) PLUMBING advice site. If you have questions about plumbing, toilets, sinks, faucets, drains, sewers, water filters, venting, water heating, showers, pumps, and other strictly PLUMBING related issues then you've come to the right place. Please refrain from asking or discussing legal questions, or pricing, or where to purchase products, or any business issues, or for contractor referrals, or any other questions or issues not specifically related to plumbing. Keep all posts positive and absolutely no advertising. Our site is completely free, without ads or pop-ups and we don't tract you. We absolutely do not sell your personal information. We are made possible by:  

Post New
Log In
How to Show Images
Newest Subjects
 Repairing/mitigating galvanic corrosion on HWH supply line
Author: md9918 (MD)

I assume from the fact that the upstream shutoff is affected as well that this is garden variety galvanic corrosion. Tank is 9 years old. I'm a semi-capable DIY plumber and have some experience sweating copper.

Is it still early enough to fix? Just concerned that when I torque on that copper, I may break the nipple and I have no idea whether that's repairable.

Planning install a flex line, which I've read have insulators to prevent this sort of thing. Is there anything else I should be aware of? Should the shutoff be replaced as well? Anode too?

Post Reply

 Re: Repairing/mitigating galvanic corrosion on HWH supply line
Author: hj (AZ)

The globe valve should be replaced. Probably little value in replacing the anode rod at this time

Post Reply

 Re: Repairing/mitigating galvanic corrosion on HWH supply line
Author: md9918 (MD)

Thanks! So should I bother trying to replace the corroded female connector or just leave it until it fails and replace the whole shebang?

Post Reply

 Re: Repairing/mitigating galvanic corrosion on HWH supply line
Author: packy (MA)

the female adapter is not corroded. the nipple is.

if it isn't wet, leave it alone.

Post Reply

 Re: Repairing/mitigating galvanic corrosion on HWH supply line
Author: george 7941 (Canada)

Next time use a brass fitting to screw on to the nipple, not copper. The steel nipple will corrode a lot less with brass than with copper.

Post Reply

Please note:
  • Inappropriate messages or blatant advertising will be deleted. We cannot be held responsible for bad or inadequate advice.
  • Plbg.com has no control over external content that may be linked to from messages posted here. Please follow external links with caution.
  • Plbg.com is strictly for the exchange of plumbing related advice and NOT to ask about pricing/costs, nor where to find a product (try Google), nor how to operate or promote a business, nor for ethics (law) and the like questions.
  • Plbg.com is also not a place to ask radiant heating (try HeatingHelp.com), electrical or even general construction type questions. We are exclusively for plumbing questions.

Search for plumbing parts on our sponsor's site:

Special thanks to our sponsor:

Copyright© 2024 Plbg.com. All Rights Reserved.