Mount connectors to your panel using the two screws located on the front of the jack. Each connector is ANSI color-coded by thermocouple Type: black (J), yellow (K), or Blue (T). choose between flat-bladed mini-connectors and round-pinned standard connectors. Round or rectangular shape to fit your instrument panel Glass-filled nylon construction provides rigidity, strength, and surface hardness. Molded barriers prevent short circuit.