Take a small sharp punch and punch a hole in it, a little off center. Then you just have to pry it out. It sits on a little shoulder. Here is a link to photos of when I replaced mine. frost plug


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!