Photos: Upper left, Clippard Valve Upgrade kit (622 version) This replaces older style valves on an airflow unit with new Clippard ET series valves.
The transducer vent manifold is replaced, P2 Manifold, the circular pieces with the valve in the middle retrofit the 590 valves electropack with
Clippard ET Series that are less expensive and have a longer lifespan.

Upper right: Newer CCDI circuit board takes all the data acquisition outside the computer so that modern
ever changing computer technology can occur with being locked-in by obsolete hardware

Lower Left: Typical Model 644 Modern Pnuematic Panel

Lower Right: P3 Pressure port selectors