The Optimizer Insert for Spinner Turbines manufactured by Norell is precision adapter which accommodate 3 mm, 4 mm, and 4.25 mm NMR tube in a 5 mm spinner turbine.
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Optimizer Insert for Spinner Turbines, NMR Tube Size 3 mm into 5 mm Bruke, Norell (CAT#: STEM-A-0002-LC)