Lincoln OEM ON TORCH, INSULATION SLEEVE, 22MM S33742 17 9SS33742 17 Medium to Heavy Duty Bridge Fabrication and Structural Steel: Consumable Kits Bridge Fabrication and Structural Steel: ASTM A572 Grade 50 and A709 Grade 50W weathering steel bridges in northern climate zones where AASHTO impact test zone requirements mandate CVN at –40 °F for fracture critical members (FCM) it is not compatible with generic TIG torches or non MK weldheads without verification of connector and protocol compatibility 22MM S33742 17 9SS33742 17 Match both the machine name and the code number on the welder rating plate before ordering this assembly