StructurePlus™ AT OMC Series Connectors Amphenol Sine Systems StructurePlus™ Family of overmold-compatible connectors are specifically designed for cable assembly operations requiring custom molding or shrink tube requirements. These engineered, one-piece, solid body connectors provide enhanced connection integrity that is an essential component for connecting cable in harsh environments. Amphenol Sine Systems StructurePlus Family of connectors consists of the AT, AT LED, ATP, and ATHD Series™. IP ratings vary depending on the series.