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A copper sweat fitting is a type of connection used in copper piping systems. This fitting is a component made of copper and is designed to join two copper pipes or tubes using a process known as soldering or sweating.
The term "sweat" comes from the method used to join the pipes, which involves soldering the fitting to the pipes using heat. It is referred to as "sweating" due to the process of heating the joint to melt the solder, creating a bond between the copper pipes and the fitting.