fuel shut off valve for string trimmer

I have a Stihl FS55 string trimmer. I want to shut off the gas to run the carburetor out of fuel after each use.



The two tubes that stick out of the carburetor for the fuel lines are about 1/8 inch OD, so the fuel lines are about 1/8 inch ID. Is there a fuel shut off valve that can work with 1/8 inch ID fuel lines?



Thanks,

Yardguy