If you have any doubts as to whether the FFD (flame failure device) in your main oven is working effectively, you should consider replacing it. An FFD is designed to cut off the gas supply if the flame in your cooker goes out for any reason. This FFD for your Parkinson Cowan gas cooker is a genuine part, and an excellent replacement for your faulty FFD. It fits straight in to your main oven in place of your existing FFD. If you are unsure whether this will fit your cooker, please enter the manufacturer and model number of your appliance on the homepage.