Fronius - Fronius TTB 220P / TTB 400P Wear parts - gas lenses (1.0/ ø19 x 50 - 4.0/ ø19 x 50) Fronius TTB 220P / TTB 400P Wear parts - gas lenses (1.0/ ø19 x 50 - 4.0/ ø19 x 50), different versions see variants.