Wanted to flush my radiator and stripped the inside of the plastic petcock with the screwdriver. Does anyone know the size and thread pattern to replace it with a metallic plug I can get at the local auto parts store? Thanks.

 

you can use a closed end wrench to get it off, and just take it with you to the auto parts store to find a replacement. Its plastic threads so be careful not to tighten it to tight. hope this helps