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No specification found for this NSN.
An adapter having standard pipe threads on one end or an unthreaded end designed to accommodate a pipe. the other end has standard hose threads, an incomplete part of a threaded end connection that grips the fire hose directly, or is unthreaded and designed to accommodate a fire hose. it is designed to join a pipe or pipe fitting to a fire hose or fire hose fitting in a straight line.