Lincoln K and KP Numbers › Lincoln Electric KP3991-6 CONDUIT LINER 6' Lincoln Electric KP3991-6 CONDUIT LINER 6' Sale Price: $94.29 Original Price: $105.60 CONDUIT LINER 6' PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000 Add To Cart Added! CONDUIT LINER 6' PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000