Suitable for laboratory liquid filtration as well as stack or ambient gas sampling, piston-powered Rocker 300 operates at 50 dB and has oil-free design that minimizes maintenance requirements. Unit is equipped with 1/8 hp motor and provides maximum 20 Lpm (110 V/60 Hz) or 17 Lpm (220 V/50 Hz) of free air displacement and 650 mm Hg max vacuum. Also included, moisture trap/vacuum regulator filters particles and moisture from inlet air.