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Size & Type: 100mm (4") long fully threaded 1/2" BSP brass running nipple. Dimensions: 15mm internal diameter and approx. 20.5mm external diameter (standard 1/2" BSP). Function: Connects two female-threaded fittings seamlessly. Use Cases: Suitable for heating systems and hot/cold water applications, indoors or outdoors. Installation: Simple to fit - tighten securely using a spanner.