K9 self-propelled artillery has been exported to account for half of the world's self-propelled artillery market. We have developed and are supplying filters for filtering engine oil of K9 self-propelled artillery. We have all the equipment to test the performance of the K9 self-propelled artillery's engine oil filtration filter and verify the quality of the product every year during production. It has low pressure loss, high filtration efficiency, durability that does not break even at a pressure of 4kgf/㎠, and quality that does not break even at minus 40℃ and 120℃.