This through adaptor assembly is used on a populated patch panel to identify which fibre cords are through spliced. Through splicing is typically needed for DWDM systems. The through spliced fibre does not have a connector fitted to it. A contrast is achieved by the items being coloured red, which stand out against the other green or blue coloured through adaptors housed on the patch panel. A Ø2.0mm optical fibre cord is passed through holes in a dust cap, a red through adaptor and a red boot, as it travels to the splice tray. This item is supplied in a bag of 10 x SC size assemblies.