Abstract: A pair of parallel cylindrical rollers have contrarotation maintained by a pair of gears. The cylinders and gears are enclosed by a housing that acts as a safety shroud, and one of the cylinders is rotated manually by a drive member external to the shroud. The safety shroud has an entrance slit and an exit slit for passing a tube between the rollers, and the dimensions of the slits transverse to the roller axes are carefully selected to prevent entry and damage to the fingers of children and adults. The shroud housing provides bearings for the rollers and for a spring mounting of one of the rollers to admit tubes of varying thickness and to grip tubes securely regardless of irregularities in the tube being squeezed.