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Apparatus for filling NMR tubes at low pressure with parahydrogen gas. V1 through V5 correspond to manual butterfly valves: V1 is an aluminum tank valve, V2 is used to normalize the apparatus to atmospheric pressure, V3 is a valve built into the cap of a low-pressure NMR tube, V4 allows evacuation of the assembly, and V5 is a relief valve for preventing inadvertent explosion of the glass components.
