OTC 5286 Portable Diesel Particulate Filter Cleaner Lightweight and Highly Portable - ideal cleaning system for use in the shop or on a service truck. Flexibility - clean DPFs from 6 to 15.5 in diameter using shop or compressed air of at least 100 PSI Fully Automated Operation - once started&#44; the cleaning process can be completed with minimal operator Focused Air Jet Technology - concentrates a precise high pressure stream of air directly into every cell. Easy Maintenance - contains no internal filters that require user maintenance.