Pfeiffer THP2301 P C T X S Turbomolecular Pump With TC-750 Special Controller. Pfeiffer Turbomolecular Pump With Controller. Mod: THP2301 P C T X S. This does not mean that the unit doesn’t work, only that we have not tested or checked it out. This may also mean that we are not knowledgeable in this specific item. The item comes with what you see in the pictures. If you don’t see it you probably won’t get it. It will be determined by the size and the care that has to go into packing an item.