Reviewer:
Jesse Pisano
from West Chester, PA United States
this is a must have for paintball tanks so the threads dont get messed up. Just like the other guy said the threads are a little sharp and that could be improved.
It also comes with a free red oring!
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A must for all bottles without one!
April 7, 2011
Reviewer:
Anton Tourzas
from Maroussi-Athens, Attiki Greece
It matches all Ninja tanks. It has a nice red spare o-ring that comes with it. The threads could be made a bit more clear and smooth so that screwing could be easier. I inspected them with my finger and they were crude and sharp.
protects the threads 
A must for all bottles without one!