Clear glass replacement chimneys are essential in the restoration of antique lamps. Rayo, Rochester and some Banquet hurricane lamps require taller glass replacemnet chimneys with 2-5/8" bottom fitters. Glass replacement chimneys on converted oil lamps should use low wattage torpedo shaped light bulbs to reduce heat build up. Glass replacement chimneys may have occasional slight imperfections reminiscent of original chimneys.