We have an all metal sprinkler system. I need to have one head capped. What is the chance of the pipe breaking? Is it better to leave it alone? The sprinkler head in question is going to be right in between pavers of an occasionally used pathway

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    why would the pipe break from capping a sprinkler? – Steven Mar 28 '13 at 3:41

The chances of breaking the pipe with equipment are the same whether capped or not. You can minimize the risk further by digging out the riser and plugging the fitting below.

If you live in an area subject to hard freezing, you will need to make provision for draining any lateral line serving the former head. Lines are usually cleared by blowing them out in the fall. A capped riser will have mostly air, but any horizontal pipe serving only that riser will fill with water and need to be cleared. This may just be a matter of removing the cap before clearing the lines.

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