What is used between two different types of metallic pipes when connecting them?

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When connecting two different types of metallic pipes, a dielectric kit or fitting is utilized to prevent galvanic corrosion, which can occur when two dissimilar metals are in contact with each other in the presence of an electrolyte (like water). This type of fitting is designed to electrically isolate the two metals while still allowing fluid to flow between them.

The dielectric fitting serves as a barrier that stops the flow of electrical current, thereby preventing corrosion that could compromise the integrity and lifespan of the piping system. It's especially important in plumbing and heating applications, where water can conduct electricity and facilitate corrosion between the different metals.

The other options, while applicable in various plumbing and piping scenarios, do not serve this specific purpose of preventing galvanic corrosion between dissimilar metals. Standard couplings and union fittings are typically used for connecting pipes of the same material or for ease of disassembly but do not provide the necessary electrical isolation. Flexible connectors are valuable for accommodating movement, vibration, or thermal expansion but do not address the corrosive issues that arise from the connection of different metal types.

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