Old bathroom supply valve

[Tou Lee]

Does anyone know what the silver part is and how to remove? I'm replacing the old bathroom sink faucet and it didn't have a shut off valve so I thought I'd add one while I'm at it...but I don't know what this is and can't turn it. Maybe it's just old and a bit stuck? I was able to remove the water connector fine (gray line).

 

[Twowaxhack]

Probably a 3/8” fip x 3/8” compression 90.

 

[RickFlorida]

Is that galvanized steel pipe? Where is this house and when was it built? It's going to be hard to remove that nickel plated piece from the galvanized steel pipe.

 

[Tou Lee]

Is that galvanized steel pipe? Where is this house and when was it built? It's going to be hard to remove that nickel plated piece from the galvanized steel pipe.

I believe it is a steel pipe (I'm just a weekend plummer at home so not too knowledgable). 1960's house in Minnesota. I tried spraying the threads with pb blaster but was still not able to remove it. I ended up just leaving it and replacing the supply line along with the faucet.

 

[TomFOhio]

You could be very careful and take a torch and heat the threads which will soften the pipe dope and help
you unscrew them counterclockwise. Then put on a new shut off valve. The nipple needs to be backed up
with another wrench when taking off and putting new on. The nipple will either be either 1/2" or 3/8" IPS.