Leaking taps under sink - how to fix?

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I am OK with DIY stuff, but I have no idea about plumbing.

We've just bought a property and it has a small kitchen sink and washing area in the basement. We've just refurbished the area and bought a new tap. After installing the new flexi tap tails directly onto the old isolation valves for the hot and cold water, both appeared to have a slow leak.

I initially though it was due to the old isolation valves and so purchased a pair of new one. However, the leak continues, even when installing this with a blanking cap (as in photo) to test with eliminating the flexi tap tail as the leak source.

From what it looks like, it seems the short stubby upward pipes are mis-shapen, and no longer a perfect circle. Therefore, I presume when unscrewing the old taps or connecting the new tap, the isolation valves have slightly shifted and the lack of a perfect seal with the mis-shapen pipe is causing the leak. I am thinking this as the new olives do not seem to result in a perfect tight crush and seal on the pipe after tightening.

The red circled short pipe is the ones I presume are mis-shapen and the bottom of the blue circled but is where the leaks are coming from. The one circled is the cold water inlet with a new isolation valve and blanking plate. The one not circled is the hot water inlet with the old isolation valve and new tap tail connected.

I am not a plumber and have no welding or soldering tools and am looking for a way to fix these.

Is it possible for me to cut the pipes where the two red lines are on the second photo and replace from there on with the Flomasta, Speedfit or Hep2o plastic fittings and pipes? This is appealing to me for ease of installation, I'd feel comfortable working with plastic fittings, and the Hep2o keyless stuff is widely available in my local Screwfix, so I could get all I needed for the 15mm piping and all the fittings from there.

Any suggestions on best way to fix for a DIYer with limited plumbing tools?

Also, what are the two ends with the downward facing tap-like hose on them?

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Last edited:
Cut back pipe where cable tie is and cap it off.?
The valves are for draining down , they allow a hose to be pushed on to drain down pipework .
 

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