Have Questions?
Professional-grade parts used trackside.
Expert help during business hours.
Encrypted checkout & trusted payments.
Orders ship quickly from regional warehouses.
The K&N Engineering Universal Rubber Oval Air Filter, part number knnRU-1390, is designed to provide reliable airflow for a wide range of applications including racing vehicles, generators, snowmobiles, tractors, and radio-controlled cars. Crafted with durable, pliable rubber flanges, this filter absorbs vibration and ensures a secure fit, even allowing for slight stretching of up to 1/16 inch (1.5mm) to accommodate different intake sizes. Its versatile oval shape and 20-degree angle make it suitable for various installation configurations, providing optimal performance regardless of the intake setup. The filter*s construction emphasizes durability and ease of maintenance, as it is washable and reusable, reducing the need for frequent replacements and supporting eco-friendly operation. Its universal design means it can adapt to many equipment types, ensuring efficient airflow and engine protection across diverse outdoor and industrial environments. Please note that this filter is not CARB-approved but requires acknowledgment of this detail during installation. The product is lightweight, weighing approximately 0.16 pounds, making it easy to handle and install. Whether used in motorsports, outdoor power equipment, or recreational vehicles, the K&N Universal Rubber Oval Air Filter offers dependable filtration and long-lasting performance for a broad array of applications.
Features:
Order Processing
All orders are processed and shipped within 24 hours of purchase (excluding weekends and holidays).
Orders placed after 3:00 PM EST may ship the following business day.
Shipping Methods
Customers select their preferred shipping method and speed at checkout.
Shipping times are determined by the carrier and cannot be guaranteed by us.
Tracking information will be provided once your order has shipped.
Shipping Coverage
If your package arrives damaged, please notify the delivery driver immediately and contact the shipping carrier to file a claim.
You must report any missing or damaged items within 14 days of delivery.
After this time, we cannot be held responsible for lost or damaged items.
Return Window
You have 30 days from the date of delivery to request a return.
After 30 days, we are unable to accept returns, exchanges, or refund requests.
Eligibility
Items must be returned in their original condition—unused, unwashed, and with all tags and packaging intact.
Certain products may not be eligible for return (e.g., special-order items, customized products, or perishable goods).
Items that have been altered, installed, or modified cannot be returned.
Return Process
Contact our Customer Support team to request a Return Authorization (RMA) before sending items back.
Once your return is approved, you’ll receive instructions on where to send the product.
Customers are responsible for return shipping costs unless the item was defective or incorrect.
Refunds
Refunds are issued to the original payment method once the returned item has been received and inspected.
Please allow 5–10 business days for the refund to appear on your account.
In some cases, a restocking fee may apply (if applicable, this will be disclosed during your return authorization).
