Using this ceramic gas nozzle is easy. First, make sure your Fronius THP 300i TIG torch is turned off. Then, carefully attach the nozzle to the torch. When using, keep the torch at a proper angle to get the best results. Remember to turn off the gas supply after use. For maintenance, clean the nozzle regularly with a soft brush to remove any debris. Avoid using harsh chemicals as they may damage the ceramic material. If you notice any cracks or signs of wear, it's time to replace the nozzle.