1. Disc-type valves increase efficiency and lengthen life
2. Finned cast-iron intercooler maximizes cooling and lengthens life
3. Rugged cast iron cylinder head withstands stress from heat
4. Threaded plugs simplify access to valves
5. Replaceable needle bearings lengthen rod life and simplify service
6. Precision honed cylinders increase efficiency and oil control
7. Four piston rings increase efficiency and oil control
8. Centrifugal unloader provides no load starting
9. Two oversized tapered roller bearings lower friction adn extend crankshaft life
10. Sideplate eases access to crankshaft and rods
11. Replaceable insert bearings extend rod life and simplify service
12. Cast iron crankcase reduces vibration
13. Automotive type, large diameter ductile iron crankshaft provides extra strength and longer wear https://www.nhproequip.com/saylor-beall-air-compressors-made-in-usa