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ive fitted many flexi connectors straight on service valves in my time its i think about not over tightening,i normally spend 5 mins taking tools to van check when i come back,,then 5 mins invoicing,chatting and check again befor i leave.never had a come back.
i meant to say i not had a come back
 
on the subject of tightness,,ive put my hand on a bath mixer tap both hot and cold and unscrewed by hand amazed, when i explained to the client she told me 20 years ago installed,i really not quite understand.
 
Neither do I!
With flexible rubber seals you can actually get them to squash into the rubber a reasonable amount by hand. In my case I always feel the need to give them a decent nip with a spanner.
ive fitted many flexi connectors straight on service valves in my time its i think about not over tightening,i normally spend 5 mins taking tools to van check when i come back,,then 5 mins invoicing,chatting and check again befor i leave.never had a come back.
I recently installed several vanity units at my daughter's,the taps came with flexis and I screwed them straight to service valves. In view of some of the comments on here I went back and put tap tail adaptors on.Three of the compression joints went on fine but I couldn't stop the fourth from dripping even when really tight. I ended up taking it off but then couldn't get the olive off, fortunately I had a spare adaptor and put that on. I couldn't help feeling that maybe I was giving myself a lot of work for nothing but some of the posts made the doubt creep in. Just as a matter of interest, if the washer did fail eventually if screwed straight to a service valve would it just weep slightly or properly leak?
 
Usually when they leak, they just weep very slightly, but can create corrosion on fittings and the pipe.
I have photos somewhere where a couple of flexi to ISO’s that leaked and first signs was damp ceiling
 
C63544E6-0160-4EEF-85A3-356011C14AE7.jpeg
 
Case proven mi lord 🙄🙄🙄

Lol! Yes, photo evidence has caught the culprit. 😛
I recall that was a 9 years old bathroom done by an idiot plumber who did a lot worse. (Shower waste was next thing to literally flood the kitchen below).
Those pipes were hidden behind pedestal and leaks corroded pipes badly, remaining unnoticed until ceiling below got damp
 

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