I have to replace about 20 feet of 1-inch black poly pipe between the
house and the five-zone manifold. About six feet of the pipe passes
under a paver brick walkway, which I don't want to disturb. The pipe is
about 6-8" below the soil, in Central New Jersey.

The first sprinkler company I called said the walkway must be disturbed,
and it would be up to me to make arrangements to remove and restore the
pavers. If I tackled that job myself, then I could easily replace the
pipe as well.

The second company said he would simply pass a 3/4" section of pipe
through the existing 1" pipe under the walkway, then use adapters to
transition back to 1 inch. (I don't know if meant to make the entire run
3/4" or just the part passing under the walkway. He's looking over the
job tomorrow.)

I asked about the reduced flow available through the 3/4" pipe. He said
that as long as I don't have more than five sprinkler heads on a zone, I
would be okay. My heads are by Hunter and there are only five per zone,
so it sounds okay.

Any other suggestions for not disturbing the walkway, or comments on
using 3/4" pipe?

Thanks,

Ray