Correct, It can’t be used where it will be exposed to sunlight, however, it can be buried. So using it for an underground sprinkler would be ok. The above ground would need to be of another material. Always check your local building codes. I was mainly speaking of using if when installing the flow meter. MIne will be indoors. I assume most are indoors or hidden.
Q: Can PEX be exposed to sunlight?
A: No, PEX pipe is not approved for continuous UV exposure. PEX pipe should not be stored or used in direct sunlight.
Q: Can SharkBite PEX pipe be buried?
A: Yes, SharkBite PEX pipe is approved to AWWA C904 which covers PEX pipe in regards to burial. Be sure to check with local, city or state codes to see if the pipe needs to have sleeves or any type of protective burial for your area. PEX pipe can be used as a service line based on its corrosion resistance to soil and water, its long life, and its oxidative resistance.