1. Barrel This high precise barrels only for dispenser are designed to stand high pressure considering the liquid’s flow property. It’s designed to dispense highly viscous liquids with no remainder. The shapes and the materials are decided in consideration of safety. 2. Piston It plunges materials filled in the barrel with no remainder. There are three kinds for highly viscous Materials (H:light blue), low viscous materials (L:white) and for prevent liquids from contacting air (R:rubber). 3. Top cap It is used to close the top of the barrel when you fill it with liquids in advance store liquids after use. 4. Tip cap It is used to close the bottom of all kinds of barrels. 5. O-ring It is used for seating the barrel and adapter.