Using your K&N Universal Air Filter is easy. First, find the right spot in your equipment's air intake system. The pliable rubber flange can be adjusted to fit, so don't be afraid to stretch it a bit if needed. Make sure it's securely attached to prevent any air leaks. When it comes to maintenance, these filters are washable and reusable. You can clean them every few months or as soon as you notice a drop in performance. Use a mild cleaner and water to gently wash the filter, then let it dry completely before reinstalling. Remember to check the rubber flange regularly for any signs of wear or damage. If you notice any issues, it might be time to replace the filter. And always follow your equipment's manual for specific instructions related to air filter replacement.