how to join flexible tap connectors to pipe

[Gasguru]

Surely after the stopcock the pipework feeds the rest of the house in addition to the sink tap?

 

[Lower]

You'll have had some water in a pipe somewhere in the system that was trapped by an airlock. The airlock's cleared (possibly by someone opening a tap or flushing a toilet elsewhere in the house) and a glug of water has made its way out. It's very unlikely to be an intermittently leaking stopcock.

 

[Roger465]

Surely after the stopcock the pipework feeds the rest of the house in addition to the sink tap?

It does, yes... OK, I simplified my question to try and avoid complicating things. I have a mess of pipework under my sink - I've only lived here 2 years, and I guess it's had the attention of more than one plumber over the years. Here's a pic.

First thing – as you can see, there are two stopcocks. This is because, when I got the plumber out to fit a new one, he gaily (in the old sense of the word) announced “Oh, I haven't got one of those – I’ll just fit another one above it, and you can use it.” So the bottom one serves no function – it’s the top one I’m talking about.

The pipe arrowed green is the one which goes up to the mixer unit – that’s where the water started shooting out.

PS all this pipework has been there for ages - I didn't do any of it!

 

[Roger465]

You'll have had some water in a pipe somewhere in the system that was trapped by an airlock. The airlock's cleared (possibly by someone opening a tap or flushing a toilet elsewhere in the house) and a glug of water has made its way out. It's very unlikely to be an intermittently leaking stopcock.

Aaaaahh, now I didn't think of that

Nobody else in the house, and the rest of my taps are supplied from a cold water tank in the attic, but there is also one direct fed one in the utility room, and I may have used it before this happened… honestly can’t remember, but I guess what you say makes sense – thanks

 

[Gasguru]

All it takes is someone to use the water and the float arm in the cistern to drop...

 

[Roger465]

All it takes is someone to use the water and the float arm in the cistern to drop...

Seems so obvious now you say that {embarrassed}