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i can certainly give you examples of o ring problems on boilers for example britony combi ,all the parts held in by o rings .
Look at all the plastic fittings hep 2 0 ,polypipe ,jg speedfit .
Unanimously jg speedfit the worst for leaking and that is what magnaclean has picked

In my experience, the worst for leaks are Polypipe, lots of new builds up here last about 3 years then the patches appear in the ceilings, almost all of them have been polypipe fittings.
 
I like the magnaclean professional 1 & 2...I know that a lot of fitters complain about leaks on them but I've never had a single leak from one yet.
Only fitted 2 of the professional 2 ones so not much experience with them yet but seem good.
Also took a magnaclean apart the other day and found what looked like a cigarette butt in there ....
 

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