Ok international manufactures 900 system air powered pistons. This piston spread the pressure evenly across product for consistent dispensing of even high viscosity products. There are two types of air powered pistons, wiper pistons and straight wall pistons. Wiper pistons [white] provide a seal for low to medium viscosity fluids. Straight wall pistons [red] are recommended for reduced stringing with medium to high viscosity products. The air powered pistons are made from polyethylene.
