Excellent item for your Co2 tank, smart parts really knew what they were doing with this one. I've experienced MANY on/off valves and this is by far the best one. Buy it, i promise you will not be disappointed. Get a professional to install it. It may be complicated to do on your own. I went to a professional and he hooked me up with the valve and installation for only $18.00. In all honesty, this product will save you time (you will never have to change your o-rings for a long time) it will save you money (no need to buy o-rings or air as much) and it will over all improve your guns fire rate. You will not be disappointed, get this product.
Excellent addition to save you money and air, it really does save you shots. If you in the game and you are down to your last ounce of Co2, this valve will use less Co2 and give you more air to use with.