Abstract: A retrofittable filterless drain separator has an outer housing with a spherical section and an inner holding area including an inner spherical segment which is positioned and spaced apart from the spherical section of the outer housing. The separator includes vane in an inlet portion thereof which serves to direct passing liquids against an inner spherical centripetal separator so that the flow path of all liquids together with any entrained solids in the flow path is directed along a curved path which forces separation of particulate material from the liquid. A passage in the centripetal separator section allows liquid to pass through and out of the drain while retaining the solid or particulate matter in the centripetal separator. A component allowing access disposed in the spherical section of the outer housing permits easy access to the internal surface of the centripetal separator to facilitate the removal of any entrapped solid or particulate matter.