Tap flexi connections

[ReimsBlueEvo6]

Went to replace my kitchen tap (Nabis) with a Grohe one. The connections on the flexi hoses on the new tap are smaller. 3/8 rather than 1/2" I believe - please correct me if im wrong.

I bought a couple of 1/2 female to 3/8 male adapters to fit between the isolation valve and the flexi however the adapters leaked badly (looked like it was from the 1/2 side). There were seals fitted in the reducer.

Any ideas where im going wrong?

 

[denso13]

Any ideas where im going wrong?

Were they a tight fit, short threads on the valve, they maybe weren't going on far enough. Maybe need some PTFE on them as well.

 

[ReimsBlueEvo6]

No the adapters screwed fully on and seemed a good fit. The amount of water that leaked from them, I wouldn't be comfortable relying on thread tape to contain that.

I've refitted the old tap (minus the adapets obviously) with no thread tape and zero leakage.

I think its the adapters thats at fault but the felt like the fitted well.

 

[denso13]

Theses are good, you'd have to fit the with a nut and olive onto the isolation valve. Assuming they are normal valves.

Tap Tail Adaptors

These two tap tail adaptors give you the connections you need to fit your flexible tap tails with 15 mm isolation valves. The helical screw threads fix tightly onto the tap tail to make installation easy. The small size ensures you save space around the fitting and simplifies your set-up. The...

www.toolstation.com

 

[foxhole]

You can’t confirm a good fit by “feel” , may need to double up on the adapter washers to get a good seal .
The threads are probably binding before they hit the washers .

 

[Madrab]

If the reducers were tightened straight on to the top of the ISO valves and they leaked and they are they are standard ISO valves, then chances are either the fluted face/edge of the ISO has cut the seals in the reducer or the sharp edge of the valve end has pushed past them.

The fluted ends of ISO's are not designed to take a rubber seal, they are designed to accept an olive. If normal ISO's are to accept seals then ideally the sharp face end of the valve needs to be filed flat. So many installers fit flexi's directly onto the ends of the valves, some work, some don't. Some leak later, see it all the time

The tail adapters linked to above also do the same job but as described 2 new nuts and olives would then be needed.

 

[ReimsBlueEvo6]

Thanks for the replies folks. Will purchase the brass adapters linked above and fit with new olives and nuts.

Appreciate the advice. Cheers.