I REGRET SPENDING 7.00 DOLLARS BUYING THIS PLUG FROM WAL-MART. I DIDN'T NEED A NEW PLUG, MY 128L HUSQVARNA WEED TRIMMER WAS WORKING JUST FINE. HOWEVER AFTER READING THE PACKAGING I THOUGHT HUMM, MAYBE I WILL SWITCH MY RCJ8Y CHAMP..PLUG OUT WITH THIS E3.12 SPARK PLUG. WELL TO MAKE A LONG STORY SHORT, AFTER 3-5 MIN OF USE WITH THIS NEW E3.12 PLUG I HAD TO REMOVE IT AND REINSTALL THE OLD PLUG. (RCJ8Y)SPARK PLUG. TO FINISH THE JOB. THE NEXT DAY I DECIDED BEFORE WRITING THIS REVIEW I WOULD GIVE THE E3.12 SPARK PLUG A SECOND CHANCE. WELL, THE OUT COME WAS THE SAME, AFTER 3-5 MIN OF USE MY 128L WEED TRIMMER WOULD CUT OFF AS IF IT WAS CHOKED OFF. THEN WOULD NOT RESTART. I WILL NEVER USE THIS PRODUCT AGAIN, AND WILL ADVISE ALL FRIENDS TO STAY AWAY FROM THIS WORTHLESS SPARK PLUG.IT IS POSSIBLE I HAVE A FACTORY DEFECTIVE PLUG BUT....IM NOT SPENDING THE MONEY TO TRY A SECOND ONE. I SEE SOME PEOPLE HAS WROTE GOOD REVIEWS, I AM NOT KNOCKING THEIR STORIES.