A syringe with a male<unk> -Lock fitting, and a needle with female<unk> -Lock fitting (purple) which screws into it The<unk>  is a standardized system of small-scale fluid fittings used for making leak-free connections between a male-taper fitting and its mating female part on medical and laboratory instruments, including hypodermic syringe tips and needles or stopcocks and needles. Currently ISO 80369 governs the<unk>  standards and testing methods. Invented by Karl Schneider and named after the 19th-century German medical instrument maker Hermann Wülfing Lüer, it originated as a 6%<unk>  fitting for glass bottle stoppers (so one side is at 1.72 degrees to the centerline). Key features of<unk>  connectors are defined in the ISO 594 standards. It is also defined in the DIN and EN standard 1707:1996 and 20594-1:1993.
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