coolant drain in engine block

[diesel red neck]

hi im trying to find the part number or thread size to just plug it with a bolt. it is a engine block coolant drain valve it keeps dripping on my 2004 new holland tc 35 da parts people cant find anything in their book. i have never used it & looks like its going to break off when i try to remove it. im sure i will have to chase the threads in the block before installing a new one

 

[Ford850]

I think this thread will cover the valve you're talking about. Coolant leak question TC33D

 

[diesel red neck]

thats it thanks for the link