Using the Lincoln Caliber Gas Lens for your 9/20 TIG Torches is easy. First, make sure your torch is turned off and cool. Then, carefully install the gas lens into the torch. When you start welding, enjoy the clear view of the weld puddle and the great gas coverage. Remember to keep the torch clean and dry to avoid any damage. If you notice any wear and tear, replace the gas lens in time. Also, always follow safety procedures when using welding equipment.