Quick plumbing question re compression fitting to inlet valve.

Soldato
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So two of my toilets started running into the bowl in the last few weeks and thankfully they are fairly modern so it's a simple matter of twisting the siphon out to replace the flush valve seal which I have done, upon restoring water flow the cistern filled and then started running through the overflow so it turns out I didn't check properly and it's actually the inlet fill valve at fault. Oh well, it got a new flush valve now anyway and the old ones were fairly worn.

Now it's a pita concealed cistern and the connection to the inlet is shown in the image below, is that just a case of tightening it up until it is water tight or do I need to replace it or any parts of it? I'm 90% sure nothing like an olive fell out of it when I undid it but cannot be 100% and having tightened it up a fair bit it was leaking quite badly, what am I doing wrong? (other than attempting to diy it and save paying a plumber) There was no ptfe tape on the threads or any sealant that I can see.

1EkKDAe.jpg
 
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I'm no expert but I rekcon there needs to be an o-ring or seal between the pipe and the fitting. Otherwise there's no seal?
 
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Looks like a sealing face between the end of the threaded bit and the ribbed bit on the pipe. If it’s leaking you can try and nip it up more and failing that wrap some ptfe tape around the end of the tube so it gets pushed into the ribbed bit .
 
So I definitely dropped something into the void then lol, many thanks, I'll pick some of those up tomorrow and get it sorted hopefully :D
 
There's no harm in a little PTFE on the threaded end, as well as the washer on the other end is there?
 
It's simply not needed. The threaded part doesn't form a seal at all, and the fibre washer is all you need.

Note: if you're being strict, fibre washers are meant to be used once and thrown away once they get wet. They are compressed fibre so after tightening the joint, the fibres absorb a bit of water and expand to fill any gaps.

I've reused them with success but I also keep a 10 pack in my toolbox.
 
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