UD Athlon 25 Mini Extension tube.

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Hi guys,

Just got the new UD Athlon 25 mini, great tank and I'm loving it so far. On many of the advertisements for it they show an optional extra purchase of a 2ml extension tube, taking the tanks capacity to 4ml. Has anyone seen these or know where I'd be able to buy one. Struggling to find any online retailers at the minute but not sure if it's because the tank is fairly new.

Thanks

UD Athlon 25 Mini Extension tube.