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How to Fix Leaking Pipework Connected to Toilet - advise required

Postby solorize » Wed Jan 21, 2015 8:26 am


I wonder if someone could offer some advise on the correct way
to stop a leaky pipe connection on my toilet.

I have hand sketched out the set up of my toilet and where the
leak is. and how the pipe is connected to the cistern, see image below.

[attachment=0]toilet leak.PNG[/attachment]

The right angled pipe that pushes up into the underside of the cistern has a
chamfered (angled) plastic washer, that I guess is meant to seal
up into the threaded pipe that is on the underside of the cistern,
and then the plastic nut winds up underneath to clamp the washer
tight to the cistern pipe. FYI. there is a bit of slop ~2mm between
the side of the pipe going into the cistern and the cisterns threaded
pipe, when it situ.

The problem is that I get drips of water coming out from the underside
of the plastic nut which then moves down the angled pipe and then drops
onto the floor and creates a puddle.

I have tried to use some jointing sealant around the pipe above the
angled washer and then pushed the pipe back into the cistern, and then
put some more above and below the plastic nut, once the nut was tightened
into position. But I am still getting water dripping out from around the

I have now run out of ideas on how to stop this leak, so would be greatful
if someone could offer me some advice.
toilet leak.PNG
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Simply Build It

Postby proptech » Wed Jan 21, 2015 12:03 pm

Hi solorize
Before you do anything carefully examine the threaded end for any damage, a slight split can go unnoticed
The plastic olive, or washer, as you call it should be replaced. Take the existing with you to a proper plumbers merchants for a replacement. They may well have a rubber version.
An alternative would be to wrap the olive in plenty of PTFE tape, but not on the thread. May work !
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