This chemically resistant vacuum pump is used for lyophilization or concentration of samples containing harsh chemicals like TFA, Acetonitrile, etc. An alumina filter element neutralizes acids and removes reaction products. Internal oil case is PTFE coated. Replacement alumina element neutralizes acids and removes solid reaction products to improve oil life. Attaches to side of chemically resistant vacuum pump. One included with pump. Gold Vacuum Pump Oil is a double distilled synthetic hydrocarbon oil optimized for excellent chemical resistance. Contains no aromatic compounds or sulfur that create varnishing, sludging, and carbon build up when pumps are used with corrosives.