Hi, Are there any current regs prohibiting the use of 15mm and 22mm soft copper coils for an above ground domestic water supply? I've been given half a coil of 15mm soft copper which is coated in blue plastic and it would be perfect for outdoor tap installs as it's flexible and would require few fittings apart from the double check valve and iso valve. As it's plastic coated, it wouldn't require a separate sleeve going through the hole in the wall either. However it would still require a connection to the mains water supply and don't have a clue if this pipe is allowed. Years ago, I used similar pipe for underground mains.