Cast iron drain

[Geo422]

Drain pipe for bathroom sink cast iron the nipple that comes out of wall fell off during a faucet install.
The threads is completely rusted away on the 90 degree elbow.
Can the elbow be re threaded?
Or does the comple pipe need replacing? Sure hope not.

 

[Breplum]

I've never seen a 90 rethreaded. The beginning tapers on a standard tap need a few inches before the threads are full depth.
mfrs use special taps on fittings. You could buy and then modify a tap.
The rust out of one nipple indicates the terminal nature of your drain system which needs updating...sorry.

 

[Sponsor]

 

[Geo422]

I've never seen a 90 rethreaded. The beginning tapers on a standard tap need a few inches before the threads are full depth.
mfrs use special taps on fittings. You could buy and then modify a tap.
The rust out of one nipple indicates the terminal nature of your drain system which needs updating...sorry.

Thank you for answering!!!