In the process of some kitchen faucet repair, I noticed spot corrosion to my stainless braided supply lines. I was further concerned when I saw similar corrosion spots on my supply lines to both upstairs bathrooms. All 3 areas probably were installed 10 or less years ago as this was a 20 year ago new construction and I had done faucet replacements.

Now, stainless braided supply lines for toilets, washer and 1/2 bath with pedestal sink do not show similar corrosion spotting. Common denominator is that these affected supply lines are in vanities or under a kitchen sink where household cleaners may be stored.

Off to the big box for all new supply lines as this has me very concerned of an imminent burst.

 

Do you have a particular question or are you just providing general info?

 

Thanks,

I was just wondering if this was normal. Thought of braided stainless as pretty infallible, but I am hearing that cleaning products stored nearby can cause spot corrosion and the toilet, washer and faucet connectors to the pedestal sink (no cleaning products underneath) do not exhibit the problem.

 

It's not normal. I don't ever remember seeing those flex lines rust. Also, the lines under the pedestal sink are not enclosed. I don't think it's the cleaning products. My guess would be moisture.

 

Bleach can corrode stainless, though it doesn't really look like rust I don't believe.

Be aware when buying faucet lines, not all that look like stainless braid are. Some are just a silvery polyester type weave, not stainless at all. And it's basically just for looks, as almost all, if not all, hoses use a molded in braid in the actual water carrying inner lining and have a burst strength far in excess of any household water supply.

So it boils down to esthetics basically, don't ever want corrosion problems, use the braided polymer lines. Possibly save a buck or so per line (though the really cheap actual stainless, Homewerks brand at HD for instance, are even less)

Absolutely want the slightly shinier look, go for stainless and keep cleaners with bleach away from them.

 

Here's how bad the corrosion can get, broken stainless weaves and actual bulging of the inner core.

 

I don't think anyone does it, but manufacturers recommend changing supply lines every 5 years.

 

Looks like chrome plated connectors (probably brass, or brass plated steel) underneath. Definitely not true stainless.

What brand are they?

 

The braided stainless supply lines are Watts valves.