Bellows Air Gap Neon Housings were a standard component of traditional neon sign construction from the 1930s through the 1980s, with peak use during the 1940s–1970s classic neon era. As part of the high-voltage electrode connection system, these housings were installed between the neon transformer and the glass tubing to maintain a safe "air-gap" clearance that prevented electrical arcing to nearby metal surfaces or moisture paths. Their flexible bellows-style design also allowed for slight movement and vibration between the glass tube and mounting structure, helping protect delicate neon assemblies in vintage sign cabinets.

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Used in conjunction with these housings were Ribbed Electrode-to-Housing Brass Caps, which created the secure electrical connection between the neon electrode and the coil-spring housing assembly. The ribbed design allowed the spring housing to tightly grip the brass cap, producing the reliable high-voltage contact that became a hallmark of traditional neon sign wiring.

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While modern neon systems have largely replaced these components with electronic power supplies, insulated PK housings, and fully enclosed channel-letter designs, restorers and collectors still encounter countless vintage signs built around these original connection methods. Our Ribbed Electrode-to-Housing Brass Caps are faithful reproductions of the classic originals, helping preserve both the authenticity and functionality of historic neon signage from a bygone era.