MRC Corporation 2.75" CFF Half Nipple Tapped Feed Through Ultra High Vacuum From the Manufacturer: We fabricate these CF nipples (spools) for UHV systems from 304L stainless steel tubing and knife-edge (ConFlat) flanges. The CF flange is the most widely used for high vacuum and UHV applications. Many gauges, instruments, accessories and feedthroughs are available on this flange system.
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