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Vehicle Info NeededK&NPART NUMBER: 599-RU-3690
RU-3690 Clamp-on Air Filter - Universal - 3.500 in. Flange ID, 9 in. H
$9499
Ships on Sep 14, 2026
Lowest Price GuaranteeUniversal
Clamp-on Air FilterUniversal Fitment 3.500 in. Flange ID 9 in. Height
- Increases horsepower and acceleration
- High air flow and filtration
- Washable and reusable
- Malleable flanges
Breakthrough Air Filtration Design
K&N high-performance air filters improve acceleration and increase horsepower output. These durable filters are available in a multiple-layer pleated, high-flow oiled cotton gauze or dryflow to enhance filtration and overall performance. Each OE-style air filter provides virtually unrestricted air flow with exceptional filtration and is washable, reusable, and environmentally friendly.
Part TypeAir Filter
Product LineK&N High-Performance OE-Style Replacement Air Filters
BrandK&N
Package Height9 in (229 mm)
Package Width6.37
Package Length11.0
Weight1.69 PG
Weight1.7 lb (0.8 kg)
Part CategoryPerformance Parts
Flange Length1.75 in (44 mm)
Filter ColorRed
Top MaterialRubber
ShapeRound Tapered
Top StyleRubber
ReusableYes
Air Filter Large End Diameter6 in (152 mm)
Filter StyleOEM
Base Outside Diameter6 in (152 mm)
Frame DesignFlexible
Flange Angle0 degrees
Flanges1
QuantitySold individually
Filter MaterialCotton Gauze
Air Filter ShapeRound Tapered
Top Outside Diameter4.5 in (114 mm)
Oil IncludedYes
Flange TypeCentered
Filter Re-Oiling Amount1.92 oz (57 ml)
Flange Inside Diameter3.5 in (89 mm)
Flange Offset0 in (0 mm)
WashableYes
Vendor Part NumberRU-3690
Package Qty1
Package TypeEA
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