Lincoln Service Parts 1 › Lincoln Electric 9SM16120 NAMEPLATE ARC POLARITY SWITCH M16120 Lincoln Electric 9SM16120 NAMEPLATE ARC POLARITY SWITCH M16120 Sale Price: $27.61 Original Price: $31.75 NAMEPLATE ARC POLARITY SWITCH PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1 Add To Cart Added! NAMEPLATE ARC POLARITY SWITCH PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1