Product Description Reversible casement operator for swinging wood casement windows. Non-handed operator requires only 1-3/8 In. space between screen and sash. Heavy cast worm gear. Swings to 90 degree either way. Used by Parlyn. From the Manufacturer Reversible casement operator for swinging wood casement windows. Non-handed operator requires only 1-3/8 In. space between screen and sash. Heavy cast worm gear. Swings to 90 degree either way. Used by Parlyn.