Coolant Drain Plug Question

[Professor Marvel]

The drain cock for coolant on the block of my New Holland tractor corroded and broke off. I cleaned the mess up and chased the threads with a 3/4 in pipe tap. I replaced it with a 3/4 to 1/2 brass bushing with a 1/2 brass plug in it to drain it with. Is there any problem using brass in the block with electrolosis type corrosion due to dissimilar metals? If not, I like my new set up better than the original.
Thanks for input

 

[V1Rotate]

Maybe put some teflon tape on the threads?

 

[Professor Marvel]

Yes Sir
Put Teflon tape on all joints so that should help but I just wanted to make sure that there is no dissimilar metals problem

 

[boomer1025]

There's no problem using brass fittings on the block, just put sealant on the threads.

 

[Soundguy]

they make a thread treatment to prevent any problems with dissimilar metal.. however I'd seldom had problems with brass plugs into cast iron ..

 

[Professor Marvel]

Thanks for the input folks. I put plenty of teflon tape on it so now I feel confident with the repair.