Fire Magic Automatic 1 Hour Timer Gas Safety Shut-off Valve - 3092A. 3092A. Timers. The Fire Magic Barbecue Safety Timer offers additional safety by automatically shutting off the gas flow at pre-set times. It shuts off the gas in three different intervals: 20, 40, and 60 minutes. It features a flow capacity of 100,000 BTUs, and can be used for Natural Gas or Propane.