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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 3/8 Inch BSP thread actually measures 5/8 Inch in diameter. If your thread measures 3/8 Inch in diameter then you require the 1/8 Inch version of this product WRAS Approved Presenting the Brass Cap in 3/8" BSP size, crafted from durable brass and compliant with BS and EU standards High-quality Brass / Bronze alloy WRAS Approved quality standard