2 Pack Paccar K37-1021 Fuel Filter Element, Keep your PACC MX11/13 engine running at peak performance with this genuine K37-1021 fuel filter element. This OEM cartridge-style filter is specifically engineered to provide superior filtration for PACCMX series engines, ensuring optimal fuel system protection and engine longevity. The filter element effectively traps harmful contaminants and particles that could potentially damage your engine's sensitive fuel injection system. Built to exact specifications for a perfect fit, this genuine PACC part maintains proper fuel flow and pressure while delivering consistent performance. Regular replacement of this filter element as part of your maintenance schedule helps prevent costly repairs and maintains fuel system efficiency. Don't compromise your engine's performance with inferior alternatives - trust genuine PACC parts for reliable filtration and protection. The fuel filter part number K371021 fits KNW0RTH T680 (2013-2020) and PTERBlLT 579 (2020) models, specifically those with PACC or CUMMlNS ISX-15 and ISX-12 engines. It's also listed as compatible with PETERBlLT 567 models. The filter is a fuel/water separator element. More details: KNW0RTH . The K371021 fuel filter is designed for KNW0RTH T680 models from 2013-2020 with L6-14.9L engines. PETERBlLT: . It is also compatible with Peterbilt 579 models from 2020 onwards and PETERBlLT 567 models, also with PACC or CUMMlNS engines. PACC/CUMMlNS a Engines: . The filter is specifically designed for trucks with PACC or CUMMlNS ISX-15 and ISX-12 engines. Fuel/Water Separator: . This fuel filter is a fuel/water separator, meaning it helps remove water from the fuel system, which is important for engine performance and longevity. CROSS REFERNC P583177 PF46236 600566 WF10566 96870 K371021 FS20207