Sealing off isolation valve

[Erico19]

Prob a bit loose it’s hard to guage with plastic threads best would be to tighten up then turn the water on and tighten slowly until no water is leaking

Thank you; I'll give it a try tomorrow...

 

[Erico19]

I find sometimes if you put 2 fibre washers on the fitting it can work.

I find sometimes if you put 2 fibre washers on the fitting it can work.

I'll give it a try. I bought two fibre washers. Despite the excellent specification; the thickness of the washers I received is 1 mm only.

 

[Erico19]

I looked at it again this morning, using PTFE tape and Jointing compound, I kept one Fibre washer as there was not much space for two....Thankfully, the water did not leak out from the joint when I tested it. Many thanks to all of you for your help

 

[Erico19]

I looked at it again this morning, using PTFE tape and Jointing compound, I kept one Fibre washer as there was not much space for two....Thankfully, the water did not leak out from the joint when I tested it. Many thanks to all of you for your help

Me again...sorry.
If the isolation valve leak is fixed, I am getting now a leak from the plastric nut at the bottom of the fill valve...I checked the nut; it is tightly adjusted. May be it got a bit misaligned as I kept removing and putting back the toilet cistern...any advice please? Thank you

 

[ShaunCorbs]

The nut against the cistern ?

 

[Erico19]

The nut against the cistern ?

outside and at the bottom of the cistern,see please the top arrow in the attached image, leading to the external isolation valve

 

[ShaunCorbs]

Need to remove it all to find out why it’s leaking might be not centred etc

 

[Erico19]

Need to remove it all to find out why it’s leaking might be not centred etc

Thank you, I'll give it a go

 

[Erico19]

Need to remove it all to find out why it’s leaking might be not centred etc

I did not screw the cistern on the wall or on the toilet seat when letting the water through; doubt this could be a cause. Here is the picture of the inside, an O-rubber seems at the bottom of the valve. The nut seems too tightly adjusted.