The Jitsie air filter offers a dual-foam design with a foam rubber seal around the rim of the filter. To achieve the full advantage of the greased seal, clean any excess grease from your air filter box. Prepare the air filter as normal, but spare the task of dipping a finger in a tub of diaper rash grease. Installation is easy as the air filter fits the stock filter cage without a problem. No matter how bad or dusty the conditions are, just pull out the Jitsie filter and see how it keeps the dust and dirt out of the engine. The Jitsie foam rubber seal will pass any test with flying colors!