Used Polycold PFC-550LTPolycold PFC 550LT Fast Cycle Water Vapor Cryochiller. The Polycold Fast Cycle Water Vapor Cryochillers (PFC) effectively captures water vapor, which comprises 65% to 95% of the residual gas in high vacuum systems. Water vapor is typically the most reactive contaminant present. With the PFC cryochillers, you can expect to increase product throughput in your existing system 20% to 100% and improve quality of deposition. Sold AS IS with no refrigeration