UNIVERSAL OXYGEN SENSOR, HEATED, 4-WIRES -- 20 cm long wiring; Includes butt type connector and easy-to-follow instructions; Without plug; Designed to fit screw-in type bungs; May not be compatible with flanges; Quality tested to ensure efficient fuel combustion; A high quality oxygen sensor; Features stainless steel shell, hex nut, and shield, Teflon-covered insulated wire, and high-temperature rubber internal and external seals; Helps reduce harmful emissions.