The MCM 36-040 is a 4-wire in-line modular adaptor connector, ideal for applications requiring a transition between a 6P4C modular jack and a 6P4C modular plug. Constructed with a PVC insulation, bare copper wire conductors, and housings made from PC and ABS materials, this adaptor offers reliable performance. The phosphor bronze spring wire is gold flash plated for enhanced conductivity and corrosion resistance. It's commonly used in telecommunications, data networking, and audio equipment to facilitate connections between different modular devices.