Hi, they are British conduit thread so a electrician (old) has more chance then plumber 16 treads to the inch, hard to find and pretty pricey.
You can get thread files with 16 to the inch easily and with a bit of effort sometimes this works.
The plugs are a sacrificial anode and are made from an alloy material. if the treads are very bad and can’t be repaired I have honed them and press fit a core plug with success.
Dennis
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