479-8989 (for the basic model) and 479-8991 (for the safety level) are the CAT UHE series honeycomb air filter kits applicable to Caterpillar (CAT) 320/320GC/323 excavators and C4.4/C7.1 engines. They adopt ultra-efficient honeycomb filtration technology, with a filtration efficiency of up to 99.99% (in compliance with ISO 5011 standards). These kits are original factory components (OE) and are suitable for dusty working environments.
