Sprinkler head leak

Two possibilities that I can think of - the head in question is the last one on the zone, downhill from others, and water drains from the pipe after it is shut off. o/w, I'm trying to remember...dirt in the solenoid in the valve, or just a bad solenoid? So long ago, hard to remember, and I was just the helper holding tools whilst hubby was down in the hole :o)

Is this a fire control sprinkler or a plant watering sprinkler?

Depends where it's leaking from. If it's the thread/nipple connection, use some Teflon tape and see if it fixes it.

Lawn right?

A constant leak will make me look at the zone control valve, the rubber diaphragm(sp) will become rigid/brittle/debris and not seal properly.

The downhill sprinkler head will leak the water. If this zone works; otherwise, I suggest is may not be a solenoid (replace cracked ones).

Buy a kit for the control valve, but I tend to cut them out for replacement.

-- Oren

..through the use of electrical or duct tape, achieve the configuration in the photo..

I'm talking lawn system here, but if the zone control valve turns off the zone should not constantly have water for a leak... :)

-- Oren

..through the use of electrical or duct tape, achieve the configuration in the photo..

Sounds like the control valve is leaking. I have had be as simple as a grain of sand stuck in the diaphram of the control valve. But a good idea to have a repair kit available anyway. Simple to replace if the valve is easily accessible.