This is a Nitrogen Purge Valve for CTI/Edwards CT-100, CT-8, CT-10, CT-400, CT-500 Cryo Pumps. Valve connection to the cryo pump is VCO connection and the gas line to valve is ¼” compression. Comes with 3 pin male Molex electrical connection and 3 pin female connectors to power cable. This valve is used during the Regeneration procedure and is normally in a closed position. This valve is mostly for the European Market.