? about Z valve on/off

[K Wolf]

What ever happened to Z valve on/offs? Are they still available? Were they flawed? Can they be added to an RT/ReTro/Xvalve to increase the reactive trigger function?

Thanks in advance for any info. BTW, I did search for info, but too many irrelavent threads came up for me to find the info i'm looking for.

[Army]

They do not work. They are 100% hype. The makers ripped people off. They are no longer wanted. They have not been made for years.