Plumbing help please

Horlock · 30 August 2017 at 12:22PM

I've bought a toilet which came with its own cistern. My issue is with the fill valve. My issue is the fill valve shank is completely plastic, it passes nicely through the cistern leaving a half inch threaded plastic to connect my pipe to.

My problem is that everything I've tried just give me a leek at this point. Ie inside the cistern every thing seems to be working. But I can't connect my copper pipe to this plastic 1/2 inch thread without a leak.

I've tried:

Using copper pipe with a preattached olive right at the end.
I've tried using boss white.
I've tried using ptfe
I've tried using a flex hose.

Basically the threaded plastic does not allow me to tighten anything to it tighter than hand tight, using a spanner causes the threaded bar to rotate.

Any ideas?

jimmo · 30 August 2017 at 1:33PM

I used a tap connector on mine.

Grenage · 30 August 2017 at 1:35PM

It's been a while since I've touched a fill valve, but I'm sure they normally take standard 15mm tap connectors with a washer - you won't want to use an olive.

I used fluidmasters, as they have a decent metal connector, but you should be able to get a leak-free connection with a plastic thread.

Get it hand tight, then hold the innards in place with one hand, and nip it up slightly with a spanner. Not too much, or the threads will go.

Wookey · 30 August 2017 at 1:47PM

A tap connector which will have a fibre washer come with it, a bit more of a pain would be a 1/2"x15mm 612 which is a brass coupler and only needs a few turns of ptfe.