About Expello Air Products
- Expello Air Products manufactures the Expello Automatic Drain Valve and the Expello Air Dryer. The automatic drain valve removes moisture and contaminants from compressed air systems with a powerful purge cycle every 5 minutes of vehicle operation. The resulting clean, dry air protects air brake system components and eliminates frozen air brakes. The air dryer cools and dries air after it has been compressed.