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Used where garden taps have the smaller 1/2in BSP thread. Adapts the more common 3/4in BSP thread to the smaller 1/2in BSP size. Can be fitted to the grey nut on AC1 timers and also into the larger white adaptor used on AC plus and AC Pro timers as well as 3/4in BSP tap connectors to reduce the thread size. Free postage on this item