Heavy Duty Plug (HDP) 4-port for HD19 systemThe 4 port HDP for the HD19 system is a heavy duty die mounted junction box with individual connectors for the sensors. If you have more sensors to connect, the HDP is also available in an 8 port version. It connects to the DSI 2 Die Protection Sensor Interface with an HD19 cable. Sensor connectors (both straight and 90 versions) are available separately. One per sensor is required. Specifications: Rated voltage 120 V Max. operating voltage 135 V Max