The 2RK4000L-8 with Discharge Tubes (GDT/TSS) RoHS is an electronic component made by Yageo, a manufacturer of passive components such as resistors, capacitors, inductors, connectors, and passive components for the automotive, consumer electronics, computers, energy, communications, and industrial markets. This specific part is a disk shaped component that has two discharge tubes (GDT/TSS) installed on its surface, allowing for a spark gap effect when connected to a circuit. It comes with RoHS (Restriction of Hazardous Substances) compliance and has an operating voltage of 400Vac, making it an ideal choice for projects that require a higher level of protection.