Vintage KURT S. ADLER CLASSIC 7 BUBBLE LIGHT SET (need 3 bulbs replaced)

Kurt Adler Classic 7 Bubble Light Set. The set includes seven bubble lights with red and yellow incandescent bulbs. It is UL listed for indoor and outdoor use. The set features an end-to-end connector, allowing multiple strands to be linked together. The lights are pre-tested and guaranteed to light. The liquid inside the bubble lights is methylene chloride, which has a low boiling point and bubbles when heated by the incandescent bulb. Needs 3 bulbs replaced. Good working condition.