Item also know as a Flame Tamer / Energy Saver, is a great accessory for any gas stove. Good for dispersing heat and will aid in prevention burned food and scorched pots. Especially with older pots and pans without an aluminum clad bottom.
Also great for manual glass coffemakers such as Chemex and Melitta. Will also keep contents in a glass carafe warm without the fear of cracking the glass on an open flame.