Drilling hole bath tap

Around 30mm but the instructions will specify the size. Or measure them.
 
Well, that's 3 possibilities!
Which just illustrates that no-one can specify a particular hole size. You need to measure the outside diameter of the mixer tap fixing boss and cut the hole to that diameter.
 
ChrisJP said:
Well, that's 3 possibilities!
Which just illustrates that no-one can specify a particular hole size. You need to measure the outside diameter of the mixer tap fixing boss and cut the hole to that diameter.
Click to expand...
Or read the instructions, as said.
 
Pick a hole saw that's a few mm larger that the 3/4" BSP tap inlets but obviously smaller then the tap base collars. I'd usually use a 32-35mm cutter, leaves a little wiggle room.
 

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