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Similarly one may ask, how do I know if my sprinkler head is capped?
Measure the distance between visible sprinkler heads with a measuring tape. Sprinkler heads will likely be spaced evenly in a set pattern across your landscape. Look for an unusually wide gap between otherwise evenly spaced heads; a buried sprinkler head may sit midway between them.
Considering this, can individual sprinkler heads be turned off?
Rotor (or gear heads) can not be shut off. You have to unscrew the head out of the ground and cap it off. There are 2 exceptions to that. Both the Hunter PGP & I-20 come with an assortment of nozzles including a blank so you could install the blank nozzle and no water will come out.
Low water pressure in your sprinkler system cuts down the irrigation range and can even cause the sprinkler heads not to pop up at all. Here are some of the most common culprits: The valves on the backflow preventer device aren't all the way open. The shut-off valve or main water valve isn't all the way open.