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The recommended method for connecting dissimilar metals in plumbing is using a dielectric union to prevent galvanic corrosion. When two different metals are in contact within an electrolyte, such as water, galvanic corrosion can occur. This process can lead to significant deterioration of one of the metals over time, potentially causing leaks and system failures.

A dielectric union acts as a barrier between the two metals, interrupting the electrical pathway that leads to galvanic corrosion. It typically consists of a non-metallic insulating material that separates the two metal components, ensuring they do not directly contact each other. This method effectively prolongs the lifespan of the plumbing system by safeguarding against corrosion, making it the preferred choice when connecting dissimilar metals like copper and galvanized steel.

Using solder is not suitable for connecting dissimilar metals, as it does not provide the necessary electrical isolation and can actually promote galvanic action. Metal clamps might secure connections but do not address the corrosion concerns, while PVC fittings are not relevant for metal-to-metal connections as they are designed for different applications entirely. Therefore, employing dielectric unions is the most effective strategy for maintaining the integrity of plumbing installations involving mixed metals.