Agilent Varian Cooling Fan Extension Cable For Large TwisTorr and Turbo-V Turbo Pumps With Remote Rack-Mount Controller, 30 Meters.
Agilent Varian Part Number PN: X3501-68011.

This Agilent Varian cooling fan extension cable, 30 meters long, is used with the large TwisTorr FS and Turbo-V turbomolecular vacuum pumps, connects to the cooling fan to the rack-mount controller (see bottom graphic to the side). The fan cable plugs into J3 FAN on the back of the rack mount controller.

Works with the following Agilent Varian turbo pumps:

TwisTorr 404 FS
TwisTorr 704 FS
TwisTorr 804 FS
Turbo-V 1001