This Fire Magic (3090) three-hour automatic gas timer shut-off valve features 1/2 inch NPT pipe fittings on both ends and is perfect for any commercial application that offers a gas grill and wants to limit their gas use. Works with natural gas, bulk liquid propane tanks and standard sized liquid propane tanks. For liquid propane use, must not be installed within 18-inches of the grill. The 3-Hour timer accommodates 1/2-inch NPT piping on both ends. The dial is marked in 3 one hour increments (any position in between is an estimate of that hour). The timer dial will auto-rotate (counter-clockwise) and will shut off the gas supply when the dial reaches off. Rated up to 100,000 BTUs/ Max temperature 125 degrees Fahrenheit. When using the timer for periods of less than one hour, you must set the dial to one hour (to activate), then return (counter-clockwise) to the desired amount of time. This will ensure proper timer operation. BBQGrills.com offers an exclusive stainless steel cabinet that holds the Fire Magic 3-Hour Timer in place and makes it easily accessible by putting it in the front of your Outdoor Kitchen.