Any spark plug gurus around?? I bought a couple of RC14YC plugs for my Toro mower w/Briggs OHV engine. The existing and one of those received has a blueish metal ring just below the hex. One of the new in same packaging (496018S / 5092 B&S) doesn't have the ring at all, just a groove. Curious if anyone has a clue as to what this ring accomplishes and/or is it necessary? See following pic.
Lawn Mower Spark Plug Question
1"Being Republican is more than a difference of opinion - it's a character flaw." "COVID can fix STUPID!"
The greatest, most aggrieved mistake EVER made in USA was electing DJT as POTUS.
The greatest, most aggrieved mistake EVER made in USA was electing DJT as POTUS.