Insulating Jacket/Liner for the Cutlass Pro RON30A Built-in Grill Head. Ensure the protection and safety of your outdoor kitchen with the RCS Gas Grills Insulating Jacket. Many outdoor kitchens are built with combustible materials. The RCS stainless steel insulating jacket protects not only the outdoor kitchen from the heat your grill produces but also protects the grill from corrosion. Each grill insulating jacket features durable double-lined 304 stainless steel construction for maximum strength and protection. 304 Stainless Steel. Cut Out: 35 1/2" Wide X 21 1/4" Deep X 11 3/4" High. Required when installing a grill into a cabinet constructed with combustible materials.