Water leak under toilet tank, is there a special spanner/wrench for this?

[John2016]

Discovered a leak on the bathroom and managed to find the source, what is the best wrench to get behind her and tighten the nut?

 

[CountryFan]

Probably a crows foot or adjustable basin wrench

 

[Mister Banks]

Be careful not to overtighten, it is easy to go to far and make the leak worse.

 

[John2016]

Probably a crows foot or adjustable basin wrench

Thanks, any idea which size I would need?

 

[terryplumb]

I suspect you may have to separate the cistern from the pan to get to that nut.

 

[CountryFan]

Thanks, any idea which size I would need?

A Crows foot tap wrench is a fixed size and the adjustable speaks for itself.

 

[JohnD]

There will be a rubber washer inside the tank, which makes the seal. After many years the rubber perishes (sooner if you use cistern bleach blocks). It may split if you tighten too much.

So you may need to drain the cistern and take the fitting out to replace the washer.

I don't know if there is a better washer that lasts longer.

 

[HERTS P&D]

Fit a new brass shank fill valve.

Andy