This is a 5 kg container of charcoal (activated carbon) for the Edwards ITC20K (ITC-20-K) Inlet Chemical Trap. The ITC20K (ITC-20-K) Inlet Chemical part number is A442-15-000.The standard sorbent charcoal (activated carbon), has relatively high trapping properties (absorbs around 25% of its own weight), even when large amounts of water vapor are being pumped. The standard amount the ITC20K Inlet Chemical Trap holds is 0.4kg of charcoal (activated carbon).