The D3 is the smallest fuel operated steam engine in the Wilesco range, it measures 16 x 12.5 cm with a 50 cm³ boiler capacity. The two sight glasses show the water level. With a full water tank, the D3 requires small breaks in operation to build up enough steam power. Once the water level reaches half full, the model is ready for continuous operation with its characteristic noise. Features · Filigree engine with upright boiler · Oscillating cylinder · Two water gauge glasses · Made in Germany, GS marked by TÜV Nord Specification Boiler Capacity 50cc Fuel Wilesco Fuel Gel Runtime Approx. 10mins Wilesco Power Output Rating 1 - What does this mean? Kit or Preassembled? Preassembled Drive (mobile only) Colour Scheme Brass, Red Weight 0.6 kg Flywheel Diameter 35mm Pressure release valve? Yes Whistle? Yes Pressure gauge? No Water sight glass? Yes Number of Cylinders One Included in the box… 1x D3 live steam model engine, 1x water filler, 1x sachet of steam oil, 1x Burner Tray suitable for gel, 1x Wilesco Fuel Gel 100ml, manual for safe operation (English included).