Which method is NOT a valid way to fix a leaking copper pipe joint?

• A. Duct tape to seal the leak.
• B. Soldered joint.
• C. Crimped joint.
• D. Compression joint.

Answer: (A)

Fixing a copper pipe joint properly means creating a true metal-to-metal seal that can handle water pressure. Duct tape can’t do that. It isn’t rated for potable water systems, and it degrades with moisture, temperature changes, and pressure, so it won’t stay sealed and won’t meet plumbing codes. Soldered joints bond the pipe with molten solder and flux, giving a permanent, leak-proof seal. Crimped joints use a special sleeve and a crimping tool to squeeze the fitting onto the copper for a strong connection without heat. Compression joints rely on a nut and ferrule to compress around the pipe, providing a reliable seal and the option to disconnect if needed. Since the question asks for a method that isn’t valid, duct tape is the option that fails to provide a proper, durable repair.