Trangia Storm Cooker Duossal Gas Burner 27-1 UL. Duossal is a perfect combination of two materials in one pressed together under high pressure. Aluminium on the outside for good thermal conductivity and stainless steel inside which makes the pans scratch resistant and easy to clean. Duossal pans are durable and heat up quickly. Specifications for Trangia Storm Cooker 27-1 UL Duossal Gas Burner: Manufacturer: Trangia Packed Size: 7.28X3.94 in Weight: 970 g Fuel Type: Isobutane Fabric/Material: Stainless Steel Aluminium Body Material: Aluminium Model: 27-1 UL Boil Time: 8 min. (1 liter) Package Contents: Trangia Storm Cooker 27-1 UL Duossal Gas Burner Pan Grip Strap Trangia 127271: Storm Cooker Duossal Gas Burner 27-1 UL