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This listing is for a Pack of 5 THIS IS TO SEAL A 15MM COMPRESSION FITTING. Thread is 1/2 inch BSP thread Most plumbing products are measured using BSP thread dimensions which measure 1/4 inches larger than that stated, therefore this 1/2 Inch BSP thread measures approximately 3/4 inches in diameter We recommend using PTFE tape or a jointing compound for a permanent seal WRAS Approved