Lincoln Service Parts 1 › Lincoln Electric 9SG6911-59 VALVE, CHECK, 1/8 NPT G6911-59 Lincoln Electric 9SG6911-59 VALVE, CHECK, 1/8 NPT G6911-59 Sale Price: $145.47 Original Price: $167.29 VALVE, CHECK, 1/8 NPT PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1 Add To Cart Added! VALVE, CHECK, 1/8 NPT PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1