I am a general contractor. I did a bathroom remodel. My plumbing sub replaced the shower valve. Now the user is getting rusty water after many weeks of flushing. I’m not getting a straight answer out of my plumber. Any knowledge out there about this. Thanks, Bob
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It is to code to run a galvanized nipple between the diverter valve and the spigot (actually runs inside the spigot). Usually 5-1/2" x 1/2" give or take a 1/4". Cheap and readily avilable to use galvanized. But what should be used is a brass nipple there. Then you get no rust.
Does this happen just through the tub spigot and not the shower? Just on start up and not afterwards? Then is it almost certainly the aforementioned nipple.
Otehrwise, maybe some galzanized got used further into the wall?
Thanks for the response. This happens through the tub and not the shower. Brass was used. The rust is really dense. One thing I don't understand is why the rust water comes out of the tub and not any place else. The sink is fine. All of downstairs is clear too. After the water is turned on, the rust water clears. I grew up in Juneau. Funny how small the world is sometimes.
"This happens through the tub and not the shower. . . . After the water is turned on, the rust water clears."
How do you KNOW that a brass nipple was used inside the spigot? Sounds exactly like the problem. Check again. Brass-coated steel? A steel reducing bushing? Cheap spigot? Do some disassembly with and look with a bright light for the what has been corroding.David Thomas Overlooking Cook Inlet in Kenai, Alaska
A magenet also works too.
I bet you're right. This was brought up by my pop too. I wasn't thinking about the spigot. Bingo! Thanks so much to all of you that replied. This is a great resource.