Hi Callum,

It sounds like the thread on your 15mm to 1/2 inch converter might not match the thread of your bath tap connection. Check if the threads are BSP (British Standard Pipe) or NPT (National Pipe Thread), as they are slightly different. You may need a BSP adapter if you’re in the UK. Alternatively, inspect for any burrs or debris on the threads that could prevent proper fitting. If you’re unsure, take the tap and converter to a local hardware store for advice or consider a universal tap adapter for easier fitting. For a more permanent solutions, explore our shower replacement services page.

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