These actually leak a LOT more than the standard plastic tops that come on the cartridge. These do not leak out of the center hole, but rather out of the edges where they connect to the plastic cartridge. Just pop one of these on a tank, fill it 1/4 full, and leave it sitting on its side on the table for a little while.. you'll see what I mean.
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0 of 0 people found the following review helpful:
Works Great!
October 6, 2011
Reviewer:
Anonymous Person from Fort Worth, TX United States
end caps are so much cheaper than replacing tanks. they work great and Vicki is the best!!!!
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1 of 1 people found the following review helpful:
These are a must!!
July 17, 2011
Reviewer:
Anthony M from walnut creek, CA United States
These are better than the ones that come with the cartridges. They do get all opened up quickly in the center leaking your juice into your atomizer. At this price I can replace the bottom cap instead of the unit. Cignot Is the place for pricing and customer service. Thanks Vicki
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5 of 5 people found the following review helpful:
Lovely
May 29, 2011
Reviewer:
Anonymous Person from Temple City, CA United States
These are a must. I have tried both Tank-A and Tank-B atomizers and all have leaked. These caps do the job and keep me from getting juice all over my fingers.
These leak more than the standard plastic tops 
Works Great!