Glow Plugs
 

Had given to me a sip lock bag of new mixed up plugs. None have identifying Numbers. Is there any way to tell me if they are hot or cold? Thanks

Usually the cold to medium plugs with have a thicker element and the medium to hotter plugs will be thinner.

I kinda figured that but wanted to confirm this. Thanks

Do any have a colored ring on top? O.S. plugs are labeled. NR plugs are as well. Looks like K&B's might not be from an old stash I have.

I'll check this weekend, and let you know. Thanks