Im not sure about everyone else, but i bought this for my NINJA tank and it works GREAT, the magnet has never fallen out, it's shiny, and i got it last December. And it's not ninja's fault for it not fitting on a NON NINJA fill nipple, lol.
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AWFUL!!
June 5, 2012
Reviewer:
KennyB
from Salt Lake City, UT United States
This product is terrible. I just got it, put it on my 68/4500 Ninja tank. It fell off on the field during a game and I lost it. The magnet is very week. They should charge $1.00 or less for this item. really, $9.95 for this little piece that does not work? I don't recommend this to anyone. Way over priced and it doesn't work. I love my Ninja tank, everything else they make besides the tank seems to blow. If you want a nipple cover, get a cheap rubber one. It will last longer and cost you less.
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Nice, but doesn't fit all fill nipples.
August 26, 2011
Reviewer:
nerdcore
from Northern California
Bought this cap for my Guerrilla Myth G2's fill nipple (i know, blasphemy) but the G2 nipple is actually slightly too short, which was disconcerting as the nipple is also too fat for other fill nipples.
But i do have a Ninja reg on a different tank, and the cap slides on it rather fittingly, and the magnet is strong enough to snap it in place and keep it there.
Pretty nice cap, although i can only recommend it for Ninja reg fill nipples.
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ninja magna cap
May 3, 2011
Reviewer:
Anonymous Person
from Downriver, MI United States
I thought it was a good idea. I like that it is made in the U.S.A. but i still cannot reccomend this product to anyone. 1st time out it didn't take long for it to fall off during play. impossible to find... out $10.
great 
AWFUL!! 
Nice, but doesn't fit all fill nipples. 
ninja magna cap