The Edwards CTI Cryogenics Cryo-Torr On-Board Splitter allows the CTI 9600 Compressor to operate up to three separate On-Board cryo pumps simultaneously. Normally, you would need a compressor for each cryo pump. The On-Board Splitter Box requires an On-Board cable that runs from the compressor to the Splitter Box, thus allowing for a more central module location. Requires On Board Power Cable, Link to Cable: P109744