Using this air filter is easy. Just remove the old 4.5' filter from your HSP Diesel product and replace it with this RFB - 413 - RFAB filter. Make sure it's properly installed to avoid air leaks. When it comes to maintenance, check the filter regularly. If it looks dirty or clogged, it's time to clean or replace it. Keep it in a dry place when not in use to prevent damage. Also, always use genuine replacement parts for the best performance of your equipment.