![KF (NW) Centering Rings KF (NW) Centering Rings](/cs/publishingimages/centering-rings-kf-nw-agilent.jpg)
KF (NW) Centering Rings
FKM is commonly used and has a maximum rated temperature of 200°C. Buna-N is less permeable to helium and is preferred for use in helium leak detectors and has a maximum temperature of 100°C. Centering rings have a replaceable o-ring.