3M PPS Paint Preparation System 3M PPS Paint Preparation System is a unique, closed paint system that eliminates the need for separate mixing cups and filters. Instead, paint is mixed in a liner bag which marries to a direct filter and is then mounted on the spray gun with a dedicated adapter. As freshly-filtered paint is dispensed, the liner bag collapses, allowing the spray gun to function at any angle. Liner bag and filter are disposable, leaving only the spray gun and adapter to be cleaned. 3M PPS Paint Preparation System is a cleaner, faster system, safe from outside contamination and offers considerable time and solvent savings on gun and parts cleaning. INCLUDES PPS Starter Kit (Includes Pressure Cup, Collar, Gun Adapter, 10 Plastic Cup Liners and Lids)