1. Air Pressure Gauge
2. Instrument Panel 
3. Idle Warm-Up Valve 
4. Inlet Valve 
5. Air Filter 
6. Regulator/Blowdown Valve Manifold 
7. Minimum Pressure/Check Valve 
8. Pressure Relief Valve 
9. Fuid Fill/Fluid Level Sight Glass 
10. Optional Discharge Air Filters 
11. Optional Moisture Separator 
12. Optional Aftercooler 
13. Aftercooled Machines ONLY 
14. Fluid Filter 
15. Thermal Valve 
16. Compressor Unit 
17. Fluid Cooler 
18. Air 
19. Fluid/Air 
20. Fluid 
21. Strainer
Figure 2-4: Control System with Piping and Instrumentation—375 and 425 Models