Plumbing tool?

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Is there a special tool to tighten lock nut on mono block tap under a kitchen sink , tap has a large nut around 30mm and limited access under sink.?
 
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Box spanner or adjustable basin wrench
 
I bought a 32mm telescopic basin wrench from B&Q to tighten my bath monoblock tap. I was never going to use it again so not having taken the label off, I took it back for a refund next time I went up there. :whistle:;)
 
Box spanner or adjustable basin wrench

Surely a box spanner will only work if you feed the hot and cold flexi pipes through it first. Are you possibly thinking of the brass fittings that are circular with a section missing and that use a 6mm(?) nut to hold them in place?

I too would try the adjustable tap wrench though.
 
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Surely a box spanner will only work if you feed the hot and cold flexi pipes through it first.

I too would try the adjustable tap wrench though.
Depends if they pass through it or not
 
Depends if they pass through it or not

Sorry CBW, I was in the process of editing my post when you replied.

I am not a plumber but I cannot recall seeing a kitchen sink monobloc that has a fully circular brass back nut that doesn't have the hot and cold running up inside the nut.

As per my edit, I think you are possibly thinking of the horseshoe back plates.

The OP said that the back nut is about about 30mm, IIRC they are about 32mm.
 
Sorry CBW, I was in the process of editing my post when you replied.

I am not a plumber but I cannot recall seeing a kitchen sink monobloc that has a fully circular brass back nut that doesn't have the hot and cold running up inside the nut.

As per my edit, I think you are possibly thinking of the horseshoe back plates.
No, not thinking of those, if I was I’d have said a monobloc spanner. That said, I can’t recall that I’ve been seen it where the pipes don’t pass through.
 
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Look for a crows foot spanner in the right size then use a ratchet extension with it
 
is it possible to remove the sink?

probably last resort from what you're wanting to do
 

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