Socket Stuffer® covers are screw-in covers for empty C9 sockets on your light stringer. When a socket is left empty — whether a bulb burns out, is removed, or was never installed — the exposed socket lets in moisture and debris. Socket Stuffer® covers screw in just like a bulb, then seal tight against the surface of the socket with a wide
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Worked great and DIY Christmas lights strand (empty lamp sockets)!