Kitchen tap replacement different sized flexible hose

[sp1990]

Hi,

I bought a Grohe kitchen tap to replace my existing one and have found that it comes with fixed flexi hoses that are 3/8" instead of the UK standard 15mm fitting.

I saw on an older thread that someone with a similar problem bought a tap tail adaptor from Screwfix with a compression nut and olive so I tried that, however have found the fitting under my sink has a plastic ring with a spring behind it installed (see attached pictures). I tried pulling it out and fitting the adaptor but no luck so far.

Was wondering if someone could take a look and advise on how best to proceed

Thanks,

 

[Ben-gee]

You have some check valves there.
Either keep them; use a 1/2” female iron to 3/8” male iron reducer.
Get rid of them; undo the chrome nut on the isolation valve and remove everything to the left of this. Then use the adaptors you have bought straight into the isolating valve.

 

[sp1990]

Thanks @Ben-gee, much appreciated, going to go for option one and hopefully ordered the right part

 

[sp1990]

Hi @Ben-gee,

I received the part today (see attachment) and was wondering if you wouldn't mind double checking if this is correct?

I tried to fit it to the existing pipe work but it doesn't quite fit and I was wondering whether I need to remove the silver fitting on the far left side first?

Any help much appreciated

Thanks,

 

[Ben-gee]

That fitting goes onto 15mm pipe. Not what I suggested but you can use it.

Yes remove the left hand silver fitting, you can then either fit a short length of 15mm copper pipe ( you will need another nut and olive) and then the fitting you have just bought on the other end of the new pipe.

Or

You could just fit the original adaptor which you had straight into the brass fitting, using a nut and olive (possibly stolen from the new fitting you have just bought)