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 1 Inch BSP threads actually measures 3/4 Inch and 1 1/4 Inch in diameter respectively. If your threads measure 1/2 Inch and 1 Inch in diameter then you require the 1/4 Inch and 3/4 Inch version of this product This listing is for a Pack of 1 Used for reducing the thread diameter in a plumbing fitting It is recommended to use PTFE tape or thread jointing compound to form a water tight or gas tight seal This product is available in singles, as well as more cost effective multiples of 2 and 5 from our store, Weight: 0.1322773572 pounds, Manufacturer: Primaflow