Hand-operated Nalgene units will attain vacuums of 635 Torr. Large size for over 750ml displacement has a rate of 36cc/stroke and 7 psi positive pressure at exhaust port. Small size for under 750ml displacement offers 15cc/stroke with 3 psi pressure. Both have a removable cover on exhaust port and trigger to release vacuum without disconnecting lines. Nozzle fits 1/4" I.D. tubing. Includes vacuum gauge and 2' of tubing.