Do yourself a favor and just buy the thread protector. The fill nipple cover does not fully seat and will fall off just walking to the field. Ive tried to nipple cover on both of HK's tanks but get the same result. Just buy the $1 rubber fill cover. The head protector however does work well and comes with an extra o-ring for the inevitable when your tank 0-ring breaks.
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Christmas gift
December 27, 2018
Reviewer:
Garrett Fortner from Marion, IA United States
I purchased these for a Christmas gift for my sister and dad. They absolutely loved them. My old man has the blue and silver cs2 and they match perfectly. My sister is just getting into the sport and she loves them as well to cover her blue ninja tank. Hk army let's gooooo!
Just buy the thread protector 
Christmas gift