A plug closes off the end of a pipe. It is similar to a cap but it fits inside the fitting it is mated to. In a threaded iron pipe plumbing system, plugs have male threads. Some of the popular types of plugs are:

• Mechanical pipe plug
• Pneumatic disk pipe plug
• Single size pneumatic all rubber pipe plug
• Multi-size pneumatic pipe plug
• Multi-size flow-through pipe plug
• High pressure pipe plug





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