TrolMaster DSD 1 Hydro X Dry Contact Station hydro x main controller which converts the SCC 1 and SPH 1 which converts the SCC 1 and SCC 3 cabinets into a solid sealed enclosure to allow the other TrolMaster Controllers to be installed The Trolmaster DSD 1 Dry contact module provides a simple and flexible solution to users who want to connect to & control devices using the Hydro X or Aqua X using a “dry contact” or relay to activate the device The Trolmaster DSD 1 Dry contact module provides a simple and flexible solution to users who want to connect to & control devices using the Hydro X or Aqua X using a “dry contact” or relay to activate the device Easy Operation