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IMPORTANT SIZING NOTE - Most plumbing products are measured using BSP thread dimensions which measure 1/4 inch larger than that stated, therefore these 1/2 Inch and 3/8 Inch BSP threads actually measures 3/4 Inch and 5/8 Inch in diameter respectively. If your threads measure 1/2 Inch and 3/8 Inch in diameter then you require the 1/4 Inch and 1/8 Inch version of this product This listing is for a Pack of 2 Allows you to connect two male-threaded components of different diameters in a clean, straight line without needing multiple intermediate adapters. Introducing the Reducing Coupling - 1/2" BPS x 3/8" BSP WRAS Approved quality standard