AN thread
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The AN thread is a particular type of fitting used to connect flexible hoses and rigid metal tubing that carry fluid. It is a US military-derived specification that dates back to World War II and stem
A 37° flare type end fitting for flexible hose
Threaded pipe
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A threaded pipe is a pipe with screw-threaded ends for assembly.
A threaded pipe plug; note that the threaded portion is tapered and so touches the calipers at only two points.