Description
The K&N Engineering Universal Clamp-On Air Filter Part Number RU-3870 is designed to provide reliable air filtration for a wide range of applications including racing vehicles, generators, snowmobiles, tractors, and radio-controlled cars. Constructed with durable, molded pliable rubber flanges, this filter absorbs vibration and ensures a secure attachment while allowing for a stretch of up to 1/16 inch (1.5mm) to accommodate slightly different sizes. Its universal design makes it suitable for various angles and offset diameters of air intakes, making it a versatile choice for many types of equipment. The high-quality washable and reusable filter media ensures consistent performance and long-term savings, reducing the need for frequent replacements. This product is built to meet the demands of both hobbyists and professionals seeking dependable air filtration for diverse machinery. It features a 3-inch flange diameter, a 5-inch body length, a 4.5-inch top diameter, and stands approximately 5 inches tall, fitting a broad spectrum of air intake setups. With a one-year limited warranty, the K&N RU-3870 offers peace of mind and high-performance reliability for your equipment. Please note that this filter is not CARB approved but does require acknowledgment of this for installation. Its rugged construction and universal compatibility make it an excellent choice for enhancing engine efficiency and airflow in a variety of applications.
Features:
- Universal compatibility with a wide variety of applications including racing, generators, snowmobiles, and tractors
- Constructed with ultra-strong molded pliable rubber flanges for vibration absorption and secure fit
- Stretchable flange design allows for up to 1/16 inch (1.5mm) size adjustment
- Washable and reusable filter media for long-term use and cost savings
- Designed to fit a range of angles and offset diameters of air intakes
- Includes a 1-year limited warranty for dependable performance






















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