Product information "Smooth Flow Pistons"
Fisnar Evenpress(trade mark) pistons apply pressure evenly across the fluid and trap fluid and fumes in the syringe barrel. They also help to prevent tunneling in higher viscosity fluid. Evenpress(trade mark) smooth-flow, low-friction pistons are recommended for most dispensing applications. The double-wipe design prevents air entrapment and material waste by wiping the syringe barrel wall clean.