Lincoln K and KP Numbers › Lincoln Electric KP1976-4 GUIDE TUBE EXTENSION, 5/32 Lincoln Electric KP1976-4 GUIDE TUBE EXTENSION, 5/32 Sale Price: $70.10 Original Price: $78.51 GUIDE TUBE EXTENSION, 5/32 PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000 Add To Cart Added! GUIDE TUBE EXTENSION, 5/32 PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000