flexi screwed on to iso valve

[ShaunCorbs]

Why worry? Adding a male straight will prevent the risk of a leak at the flexi flat washer seal.
Yes, you will have 3 compression connections, but they will not leak if you do them correctly. Only thing that can leak is if it is a cheap isolating valve fitted.
I have never had any bother or concern with brass joints where they are needed above floors.

or even better use a soldered male iron

 

[Best]

All they need to do now is invent a ballofix 15mm compression one end and half inch male the other with the flat face. Jobs a good un

This sort of valve would do same. Not compact slotted screw type or cheap though.

 

[Mgrant]

Thank you is filling down one end of the iso to give a flat surface not an option?

 

[Best]

Thank you is filling down one end of the iso to give a flat surface not an option?

Yes if it is your own house and you don't mind.
No if it is for a customer.
No if you don't want to waste time using a file.

Let's just say one of the flexis you connect to your filed down isolating valve starts leaking, maybe doing serious damage. Someone like me comes out to fix the leak and give a report.
The risk is I would first say - Wrong method and unsuitable fitting for connecting a washered flexi to. Then once I remove the flexi I would say someone has filed the edge of the isolating valve in an obvious attempt to make it do.
I would rather not give anyone the chance to criticise my work tbh.

 

[Mgrant]

Thanks likely an iso valve then a solderd 1/2 male then

 

[Mgrant]

if you have filed it flat you should be ok but normally just use a 1/2 male iron

Have started using this method. Do most use 1/2 to 15mm compression or soldered? It makes more joints behind a pedestal but all should be well.

 

[lame plumber]

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Yes! Seen loads of them just having been slightly weeping, but I know of one where it leaked and eventually started coming through a ceiling. Done by a plumber. Just found the photos. First photo is how it should have been done. Second photo is how the plumber did it. Sleep well! :grin:

should have been done in copper completely really