K&N Oil Filter Kn-621 K&N Oil Filters are designed with synthetic media that captures 99 of harmful contaminants while maintaining optimal oil flow rates. The distinctive feature of K&N Oil Filters is the inclusion of a 17mm nut for effortless installation and removal, known as the 'wrench off' design. This innovative nut is cross-drilled, allowing for easy attachment of a safety wire. Furthermore, the robust canister and base plate offer protection against punctures, and the double-rolled seal, along with the pre-lube gasket, ensures a reliable and secure seal. They are specially crafted to meet the requirements of both racers and engine builders, in addition to everyday motorcycle or ATV owners seeking top-notch oil filtration. Features: Compatible with conventional, synthetic blend and full synthetic oils High-flow rate synthetic media filter Traps 99 of harmful contaminants Pressure relief valve and anti-drain back valve (where applicable) Replaces OEM Arctic Cat 0812-029 / Arctic Cat 0812-034 / Arctic Cat 0812-135 / Arctic Cat 3436-021