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Brass hexagon reducing bush has been designed to reduce the thread diameter of a plumbing fitting to your desired thread diameter.
Most threaded plumbing fittings are measured using BSP thread dimensions, meaning that the actual diameter of the fitting is around a 6.35 mm larger than stated. Meaning that a 12.70 mm BSP fitting such as this Brass Reducing Bush has an outside thread measurement of approximately 19.05 mm, and an inside diameter of 12.70 mm.
