We talked about this in the past, but going to put it out there again so it comes up easily in search-

replacement drain plug for the koyo radiators is motormite or help 61137, it is M10x1.25

easy thing to ask for is nissan sentra

 

^You are a good man for taking the time to do this. Contributions like this is another example why the search function of this forum is so valuable.

 

Koyo now uses aluminum plugs for there radiators as well now. The first Koyo I picked up years ago has plastic plugs and the one I picked up about 4 years ago has aluminum.

 

My 2 yr old Koyo has a plastic plug (that needs replacing), so it appears they've reverted back to plastic. Just sharing my situation.

 

i shared this in the other thread as well- but if you break the plug DONT DRILL IT

take a flathead screwdriver and heat the tip up real good, now insert it into the plug and hold it in place for a little while, then remove it. Let it cool and just turn the plug out