How to fix leak after installing new kitchen tap

[JamesRSG]

Recently installed a new kitchen tap, installation went smoothly until tightening the second flex pipe onto the existing pipework when tightening the whole section just started to spin round. It spins in either direction with no direction seeming to tighten anything, not loose enough to turn by hand mind you. Now when the water is turned on water pours out of the bottom of the fixing. Looking for advice on how to fix as this was supposed to be an easy job and cant turn water on in house until this is fixed because the isolator has siezed and had to turn off the stopcock to attempt this job in the first place, thanks in advanced for any help (pic attached in case my description is lacking)

 

[Harvest Fields]

All of that need to be removed and put 2 x 15mm full bore isolation valve on the pipes then a new small piece of 15mm pipe and then 2 x 15mm x 1/2 compression couplers.

 

[Welder]

Errm sorry Wayne but what about the two NRVs? They DEF need to stay!

Looks to me as if the old olives for the compression fittings need removing and new ones fitting. Do agree completely about the FB ISOs

 

[DXCross]

Have you tried tightening the individual components first, using two spanners or a pair of grips and spanners holding one to prevent spinning and the other to tighten?

 

[Harvest Fields]

Errm sorry Wayne but what about the two NRVs? They DEF need to stay!

Looks to me as if the old olives for the compression fittings need removing and new ones fitting. Do agree completely about the FB ISOs

Sorry mate. Misread the OP. Thought it said taps

 

[ShaunCorbs]

Need to tighten the bottom but more

As you look at it needs turning to the right while holding the top hex on the same part / fitting not by hand need tools eg grips and adjustable spanner