Lincoln Service Parts 2 › Lincoln Electric 9ST13639-5 KNOB T13639-5 Lincoln Electric 9ST13639-5 KNOB T13639-5 Sale Price: $9.52 Original Price: $10.95 KNOB PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1 Add To Cart Added! KNOB PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1