nut size on mono mixer please

[waynetta]

Hi peeps, can anyone tell me what size the long backnut on the monoblock mixer taps are so i can buy a socket to tighten mine up as i really dont wana lift out the sink?
Are they all the same size or all different??
Thanks, wayne

 

[uug197h]

you can buy a set of box spanners (2 spanners 4 sizes) from toolstation.com

 

[John t]

Or you can get a '3 spanner ' set with one that fits the more conventional taps, 32 mm ish! Always handy to have in your tool box!