Description
The K&N Filters RU-4550 Universal Air Filter is engineered for a wide range of applications, including racing vehicles, radio-controlled cars, generators, snowmobiles, and tractors. This air filter is designed to accommodate various angles and offset diameters of air intakes, ensuring versatility across different setups.
Constructed with ultra-strong molded pliable rubber flanges, the RU-4550 absorbs vibration and allows for secure attachment. These flanges can also stretch for up to 1/16 of an inch (1.5mm) to fit in-between sizes, providing a reliable seal. The washable and reusable design of this air filter means it can be maintained for long-lasting performance, making it a practical choice for those who require efficient air filtration.
Features
- Constructed with ultra-strong molded pliable rubber flanges
- Flanges can stretch for up to 1/16 of an inch (1.5mm)
- Washable and reusable design
- Designed for a wide variety of applications
- Accommodates various angles and offset diameters of air intakes
Frequently Asked Questions
What is the K&N Filters RU-4550?
The RU-4550 is a universal air filter designed for various applications, including racing vehicles and generators.
Is the RU-4550 washable?
Yes, the K&N Filters RU-4550 is washable and reusable.
What material is used for the flanges?
The flanges are made from ultra-strong molded pliable rubber.
Manuals & Instructions
âš WARNING (California Proposition 65): WARNING: Cancer and Reproductive Harm – www.p65warnings.ca.gov

Not CARB approved. This item is not legal for sale or use on pollution-controlled motor vehicles in California or states that adopt California emissions standards. Intended for off-road / competition use where permitted by law.
















