you can buy the ninja pro reg or u can use these quick fixes! my tank's fill nipple was positioned poorly on my empire axe and i had to de-gas and unscrew my tank after games to fill up my tank. after i bought these, i used the largest clip and my fill nipple is pointed directly downwards and i can fill with an ease. you make think that the tank isn't securely threaded in with these, but once the tank is gases up, the tank will not move or unthread. the magna cap is amazing and magnet on it is real strong. stay on like a charm!
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1 of 1 people found the following review helpful:
Great
January 15, 2011
Reviewer:
Russell O'Callaghan
from Lewiston, NY United States
Is your fill nipple not in an optimal position when your tank is screwed into your asa? Then buy these. They work like a charm.
amazing!! 
