Well I added this item so I guess I will review it... I picked this up for only 3 bucks which is cheap because others are going for 6 bucks. I really like that it holds an o-ring around the top because it is hard to find other places to hold them, I was even able to fit 2 around it without them coming off. If you spent 20-30 dollars on your Co2 tank or 100+ dollars on your Nitro tank, this is a perfect investment and replacement to the stock plastic caps. One of my buddies dropped his new 20oz tank and had to buy a new one because the threads got damaged. If he was using this valve cover he would have saved $27.
An absolutely great item, if you own a paintball tank, you should own the Pure Energy Valve Cover.