Tyre going flat but no hole in tube

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mjr

Comfy armchair to one person & a plank to the next
Any valve can be iffy - not just Continental!
Conti have previous for shipping tubes with valve cores not screwed in tight. As someone on our group ride the week before last had a new Conti tube with a loose core (fixed with my mini adjustable spanner), I suspect another dud batch may have hit the market recently. :sad:
 
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