Fuel Filler Cap, BF 109 FW 190 Luftwaffe BT-12 this API Computer has a

this API Computer has a modification date of 1955 and a service date of 1965

25 inches across and ~ 3

This twin-lens indicator was fitted to the radar scope projector

The indicator essentially is measuring differential pressure in the fuel line/tank

Fuel Filler Cap, BF 109 FW 190 Luftwaffe BT-12 this API Computer has aWe have been advised that this is a WWII era Fuel Filler Cap for the Luftwaffe's Messerschmidt Bf109 Fighter, and also used on the Focke Wulf Fw190 Fighter. Manufactured by Deutche Benzin Uhrin, stamped "DBU", "Kraftstoff" (fuel), and "Beluftungsventil" (vented). The corrosion is evidence of its age, but it is in reasonable condition for such an artifact. Measures ~3 inches diameter, ~5 inches across, and ~1. 5 inches deep.