I use a SS 1/4 inch solenoid like that for my smoker that I automated. Works fine. 3/4 inch is WAY too big. You could use reducing bushings to get down to a pipe size that is appropriate for the application. You will also either have to come up with an ignition system, or put a T before the solenoid and run a pilot light to each burner. That's what I did on my smoker.