A steel elbow is a type of plumbing fitting

　　A regular elbow has FIP connection on both ends. A hub is a female ABS,PVC or copper pipe receptacle; FIP denotes "Female Iron Pipe" threads, that is, it receives threaded MIP iron, brass or plastic pipe on both ends. FIP is also known as FPT, and MIP is also known as MPT, Collectively, these are known as National Pipe Thread (NPT) fittings.

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