Stu
I have the Cycle Stop Model #CSV3B on my well. It works great. Keeps my 5 HP pump from cycling with as little as a 3/4" garden hose. My well produces 65 GPM, & the 5HP pump will deliver it while maintaining 60 PSI for my irrigation system.
Marty
I have as CSV-1 on my 3/4 hp well pump. It will let the pump run with as little as a trickle on the faucet and maintain about 65psi. I have been happy with it over the last few years. My only complaint is at times the valve will let out a loud whine. Sometimes it gets very loud. I have never figured out why it whines, although it is usually only for a few minutes.
It works very good with my irrigation system. I would say it is a must have if you irrigate with a well.