One cup with four functions: Mixing - Painting - Refilling - Storing A true all rounder. The cup stands on the bench and mixing takes place directly in the graduated cup. No need to use an extra paint kettle. The RPS cup will then fit directly to any SATA gun with the QCC connection or standard cupthread although the Minijet will require the listed adapter. The very low weight helps the ergonomics. When changing colour simply remove the cup and attach the air tight seal. The paint can be stored in the clear pot ready for its next use. Attach a new RPS cup and carry on spraying. Once the job is complete the cups can be stacked inside each other and disposed of without having to waste time and solvents cleaning cups. The cups are also available in .9L size to dramatically increase the guns capacity. Other adapters are available to use this system with other makes of gun - please phone for details.