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Every time I've tried one of these when I try to drill fixings the brick breaks away into the pipe hole!

Have you tried a 6mm bit & a slight angle away from the pipe hole?

I use these all the time, not had a problem with them.
 
I'm guessing the check valve will be an in-line one on the internal pipes. The ones built into taps don't last a winter.
 
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3y7e6unu.jpg
 

Only legal for up to cat 3 on domestic which means it still needs a 20mm air gap.
Just because it is wras listed doesn't mean it is legal to use in the situation above.

Taps incorporating a hose union outlet
[FONT=&quot] If the outlet of the tap assembly is designed to accommodate the attachment of a flexible hose and therefore potentially compromise the required AUK3 air gap, alternative Fluid Category 5 backflow protection is required, as the AUK3 air gap provided by the tap would not apply.

The only exception is on a direct replacement for an existing but a separate dc inside the building is still the [/FONT]preferred method.
 
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