Not a huge difference for the price not that you will notice alot until you go E-frame but my fully mech cocker shoots great. no problems! Got as an ebay special for 20$ so i recommend doing that instead of paying the full 40 for it. but even so if you have an e-frame i recommend it. (tho its a pain to install!)
Dye Ultralight black
Delrin back block
Eggy 2w/ z-board
Centerflag 68/3000psi nitro
Tuctite universal drop forward
Low pressure operation
Tank lasts longer
This is the best valve for the money. When I had this thing installed, I went to the paintball park and had no marker malfunctions. On a normal day of Piantball I would have both leaking and pressure problems with my marker, when it was using the stock valve. Now that I have the eclipse there have been no problem with my marker and it also lasts longer on a tank, has a little bit higher ROF, and can operate at a lower pressure than before. ( almost 0 psi)
By the nexus kit for your cocker if you have an e-blade, if not then you don't need the QEV's, but every thing else is awsome.
This is a very quality valve. It comes standard on the Nexus cocker and in the Nexus Upgrade kit. The valve is high flowing allowing greater efficiency and prevents constriction of air flow. It is light which means the overall weight of your gun is less. A good internal upgrade for any autococker. The AKA valve was better for low pressure operations but this valve was specially designed for the autococker.
A solid upgrade if you want to get a good valve. It is included with the Nexus upgrade kit which is a very good internals upgrade kit.