use a diving rod.
"Percival P. Cassidy" wrote in message
...
On 09/16/05 02:19 pm tossed the
following
ingredients into the ever-growing pot of cybersoup:

Hire a sprinkler company to blow air through the system as
though they
are draining it for the winter. Walk around listening for
air coming
out of the ground.
Then again, if you hire a company to blow air, they surely
can find and
fix all the heads for you anyway.

We didn't have the system air-blown last year, and no harm
came to it.
We did drain it, however.

Anyway, if an 80psi water supply can't open a buried pop-up
sufficiently
to produce a pool of water or a squishy patch in the lawn,
do you think
I'm going to hear anything from said pop-up by blowing air
through the
system?

I should mention that although the pop-up that just revealed
its
presence is in line with several others, it is not on the
same line as
those others. All of them are Teed into another line of
pop-ups running
parallel to them. What makes me think that there may be some
more buried
ones is that the gap between the one that just appeared an
the next one
in line with it is three times the spacing between many of
the others;
IOW, I am thinking that there may be two more buried
pop-ups. And, yes,
I have dug around where I think those "missing" pop-ups
might be, but I
haven't found anything.

Perce