the magnet is plenty strong enough, but the adhesive used to glue it to the cap is weak. my magnet came off while i was playing with it, so i epoxied it back on and had no issues with that.
however, the cap itself is not attached to the tank, so it's easy to misplace it. i think save the money, and just get a cheap rubber nipple cover that always stays attached to your tank so you never have to worry about losing it.
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great
March 12, 2013
Reviewer:
.
from .
great
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0 of 0 people found the following review helpful:
June 21, 2012
Reviewer:
Anonymous Person
from Mantua, NJ
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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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.
it works... 
great 
ninja magna cap