WeldingCity 10-pk Nozzle Insulators 34A for Lincoln Magnum and Tweco #3/#4 MIG Welding Guns Premium quality Lincoln/Tweco style MIG nozzle insulator 34A for slip-on nozzle. Work with slip-on nozzles in Lincoln Magnum 300-400 and Tweco #3-#4 MIG guns or equivalent guns. You get Ten (10) gas nozzle insulators 34A at this price We use U.S. Postal Service (USPS) as main carrier. Please provide a USPS deliverable address.