The K&N Drycharger is a silicone treated, polyester wrap that is made to cover K&N Air Filters, and the RC-3680DK is the black version sized for K&N's oval-straight RC-3680 filter. Its mesh is finely woven, so it stops dirt before it reaches the element, and its silicone finish limits the amount of water that reaches the air filter. Stitched elastic openings hold the wrap in place, and the closed top covers the filter end.
For dusty trails, gravel roads, or wet rides, a bare filter loads up faster than it needs to, and the wrap takes that first hit. Extends service interval of your K&N filter, according to the manufacturer, and the water-repellent treatment is typically lasts 1 to 2 years, so plan to inspect it at that point. The manufacturer also lists a 1 Year Limited warranty, which gives you a clear recourse if the wrap fails early.
Shoppers searching for a K&N RC-3680DK pre-filter, a black oval-straight Drycharger wrap, or a water-repellent sock for a 6-inch universal K&N filter are looking at this exact part. The manufacturer lists a 6-inch height, a 3.75 x 3-inch base, and a 2 x 3-inch top, while K&N's RC-3680 filter is 2-7/16"FLG; 4-1/2 X 3-3/4B, 3" X 2"T, 6"H. Because owners on user forums have questioned how snugly some wraps fit over certain filter sizes, measure your filter before ordering.
The manufacturer states the Drycharger is made to cover K&N air filters. Its listed dimensions are a 6-inch height with an oval-straight shape, so compare those measurements against your filter's own dimensions before buying.
The manufacturer states the water-repellent treatment typically lasts one to two years. Inspect the wrap at that interval and replace it if the water repellency has faded.
