Valve, Air Vacuum Regulating AN5828-2, US Navy R88-V-85X Instruments OH-6 Cayuse The compass would be placed

The compass would be placed in a fixed mount on top of the instrument panel or in the navigators compartment

it is in exceptional condition for its age

Measures 2in diameter and ~5

the vertical flight gyro

Here is an Anti-Icing Indicator as used on the early 1950's US Air Force C-119 Fairchild Flying Boxcar transport

Valve, Air Vacuum Regulating AN5828-2, US Navy R88-V-85X Instruments OH-6 Cayuse The compass would be placedThis is a WWII era pneumatic Valve, Air Vacuum Regulating, made by Schwien, part number 2550, as used in aircraft of the US Army Air Force and US Navy. This valve was used to regulate the vacuum pressure between its source (either an externally mounted venturi tube, or an internal engine driven compressor) and the system of pneumatically powered flight instruments, such as the Gyro Horizon, Directional Gyro, and the Turn & Bank Indicators. Accuracy of