The K9 self-propelled artillery has been exported to account for half of the world's self-propelled artillery market. We have developed and supplied the transmission filter for the K9 self-propelled artillery together with SNT Dynamics, and have obtained the DQ mark certificate from the Korea Defense Technology Quality Institute, certifying its excellent quality. We have all the equipment to test the performance of the transmission filter of the K9 self-propelled artillery, and verify the quality of the product every year during production. It has low pressure loss, high filtration efficiency, and durability even under a pressure differential of 21.1kgf/㎠, and has no damage even in an environment of minus 51℃ and 137℃.