DIGITEN FS-C02 G3/4" Male Thread Water Flow Switch 0-2A/ 0-220V(AC or DC)

If i have a gravity feed water line running through this can i make this device turn on a pump? 12V?

Another question what is the ID of the water passage

I want a 1 inch digiten fs-c0 1" bsp male thread water flow switch 0-2a/ 0-220v(ac or dc). do you have?

I wondering how much this flow switch restricts water flow? Some of the 3/4 inch flow switches I have seen have very restricted water flow.