The Petromax sp20 - compact Wrought-Iron Pan. Petromax adds the compact sp20 to its product series of the wrought-iron pans. The sp20 is ideal for all who set high priority on materials of best quality, and, at the same time, the smallest possible packaging dimensions. With a diameter of 20 cm, the sp20 is ideal for one person and fits easily in the backpack or can be attached to it.