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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 this 3/4 Inch BSP thread actually measures 1 Inch in diameter. If your thread measures 3/4 Inch in diameter then you require the 1/2 Inch version of this product This listing is for a Pack of 2 This gas meter disc has an internal diameter of 21.16mm, outer flange diameter of 25.8mm and thickness of 6.1mm High quality construction Manufactured to UK & European plumbing standards