This Agilent Varian part is a replacement Mini Ti-Ball Source for TSP Titanium Sublimation ION Pumps. The Mini Ti-Ball™ Source is a superior titatium sublimation source for getter pumping in high vacuum and utrahigh vacuum systems. Directly interchangeable with Agilent's standard TSP filament cartridge, the Mini Ti-Ball™ Source requires no additional water cooling or power. See the Agilent Varian Ti-Ball TSP Users Manual.pdf to the side of this listing for maintenance installation instructions.