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Performance Engine Oils
K&N RF-10420 - Universal Clamp-On Air Filter

K&N RF-10420 - Universal Clamp-On Air Filter


K&N RF-10420 - Single



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  • Description
  • Benefits
  • Technical Info
  • Shipping Explained

K&N RF-10420 - Universal Clamp-On Air Filter

K&N's universal inverted dome filters are engineered to provide exceptional airflow and an increase in engine performance. They are designed and tested using computational fluid dynamics (CFD) analysis, flow-bench analysis, and dynamometer testing, and incorporate a unique inverted cone design that helps direct a high level of airflow to the throttle body. Manufactured for a wide variety of applications and unique filtration needs, K&N universal clamp-on air filters feature the same advanced technology as the K&N stock replacement filters - providing quality engine protection that you can trust. These versatile filters are washable, reusable, and durable, and are constructed with ultra-strong moulded pliable rubber flanges that absorb vibration and allow for secure attachment.

Please contact us to help identify which part fits your vehicle.


  • Sizes available to fit most K&N air intake kits using 6" I.D. flanges
  • Simple clamp-on design
  • Malleable flanges
  • High flow pleated cotton filter media
  • Pioneering design of layered, oiled cotton media helps to shield your engine from contaminants
  • Can be stretched up to 1.5mm to fit in-between sizes
  • Washable, reusable, and durable
  • 1-Year Limited Warranty

Technical Information:

  • Air Filter Shape: Reverse Conical
  • Filter Material: Cotton Gauze
  • Washable: Yes
  • Flange Inside Diameter: 6 in (152 mm)
  • Flange Length: 1 in (25 mm)
  • Flange Type: Centred
  • Flanges: 1
  • Height: 6.5 in (165 mm)
  • Base Outside Diameter: 7.5 in (191 mm)
  • Top Outside Diameter: 5 in (127 mm)
  • Top Style: Plastic
  • Top Material: Black Plastic
  • Package Contents: 1 Air Filter
  • Package Quantity: 1
  • Warranty: 1 Year Limited
  • Product Style: Round Tapered Universal Air Filter
  • Weight: 1.6 lb (0.7 kg)
  • Filter Re-Oiling Amount: 1.45 oz (43 ml)
  • Product Box Height: 8.6 in (218 mm)
  • Product Box Length: 8.4 in (213 mm)
  • Product Box Width: 8.3 in (211 mm)


SHIPPING IS FREE* for orders of £75 and over , regardless of the weight of your order.
We've tried to keep all other shipping costs as low as we can.

Carriage starts at just £0.95 (inc VAT) for small items, with our most common courier rate set at £5.99 for orders of 5kg (enough for 5 litres of oil).

  • *Free shipping is available for UK Royal Mail, UPS Access Point™ (click & collect) and standard UK courier services (not express / priority / islands).
  • Courier surcharges mean we are unable to offer free "to the door" courier shipping from us in Cornwall up to Highlands / Grampian in Scotland - and because we send a lot of liquids, not every courier option is available to us. UPS Access Point™ (click & collect) is available as a free shipping option across Scotland, Wales and England, wherever there is a UPS Access Point™ Location.
  • Carriage charges are based on weight - please see our table of carriage costs for full details (although adding an item to your cart and viewing the calculated carriage is often easier!).
  • Priority shipping is also available.

How long will it take to get my order?

We give an estimate of delivery dates as you shop and in your basket. The vast majority of items are held in stock and dispatched from our UK warehouse and we'll do all we can to get your order to you as quickly as possible.

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