Question
When I turn on my system manually everything works fine except for one zone. From the time I turn it off and the time it takes to actually stop watering is about 15-20 seconds. All the other zones turn off right away. Thanks for any info.

Answer
Thanks for your question.
My guess is the solenoid or the manual activation is slightly unscrewed. Dig the valve up and tighten both. Turn clockwise. You don't need to screw them into the ground just a little until there snug.
If you not sure how to do this, reply back with the valve model # and I can give you better directions.

Matt