Using this brass reducing union kit is easy. First, make sure your hands are clean and dry. Identify the 1/4 and 1/2 flare ends according to your refrigeration pipes. Connect the pipes to the corresponding ends of the reducing union and then tighten the flare nuts. When using, always ensure the refrigerant system is turned off to avoid gas leakage. For maintenance, check the union and nuts regularly for any signs of wear or corrosion. If you notice any issues, replace the parts as soon as possible. Store the kit in a dry place to prevent rusting. With proper use and care, this kit will serve you well in your refrigeration work.