I have a corner rotor that I now need to be able to shutoff so it isn't filling the kids' sandbox. I currently have all irratrol heads, but they don't make a "lockable" head. I found the Hunter I20 that I believe will do what I need by using the "flow control shutoff". Does anyone have any experience if that will work as a "long-term" shutoff unless it gets really dry and I want to turn it back on? I'll have this problem for a couple of years, but don't want to cap the line since eventually the sandbox will go & periodically I'll still want to use that head if that area gets too dry. Any other suggestions or products that would do the same thing??? Thanks.