This Caterpillar air filter kit 321-2411 321-2412 for CAT C4.4 C7.1 engine is a filter/regulator manufactured by Caterpillar. It filters, lubricates, or regulates the pressure of air or fluid supplied to pneumatic or hydraulic equipment. It is commonly in pneumatic FRL (filter-regulator-lubricator) assemblies and compressed air systems.
