Although these have a 15 year storage life I read they can last as little as 3-5 years in use; which could contribute to the horror failure stories. Probably worth changing them every other service or so as well as using vaseline on them. - cheap, common size - from any bearing supplier with the following spec.....I think!
Petrol pipe quick disconnects :-
The 'O' rings are AS568-011 Buna N Nitrile
Cross section 1/16th" (or 0.070" or 1.78mm)
Inside diameter 5/16" (or 0.301" or 7.65mm)
'O' rings for Quick Disconects - AS568-011 Buna N Nitrile
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