Description
The K&N Filters RU-3700 Universal Air Filter is a versatile component designed for a wide range of applications, including racing vehicles, radio-controlled cars, generators, snowmobiles, and tractors. This air filter is built to accommodate various air intake angles and offset diameters, ensuring a proper fit for many setups.
Constructed with ultra-strong molded pliable rubber flanges, the RU-3700 absorbs vibration and allows for secure attachment. These flanges can be stretched for up to 1/16 of an inch (1.5mm) to fit in-between sizes, making installation straightforward. Additionally, this air filter is washable and reusable, providing a sustainable option for maintaining optimal airflow and filtration efficiency.
Features
- Washable and reusable design
- Ultra-strong molded pliable rubber flanges
- Flanges can stretch for up to 1/16 of an inch (1.5mm)
- Compatible with various air intake angles
- Designed for multiple applications including racing and generators
Frequently Asked Questions
What is the K&N Filters RU-3700?
The K&N Filters RU-3700 is a universal air filter designed for various applications.
Is the RU-3700 filter washable?
Yes, the K&N Filters RU-3700 is washable and reusable.
What materials are used in the RU-3700?
The RU-3700 features ultra-strong molded pliable rubber flanges.
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.















