Silicone O-Ring
• Chemical Applications
• 200°C Maximum

Change Your Flange Size With One Centering Ring!

The use of Adapter Centering Rings is simple:
One side of the ring is NW20 and the other NW25.
By using this centering, you CONVERT a
NW20 flange size to a NW25 Flange

NW, KF, QF Series High Vacuum Flanges

NW20 (KF20) OD: 1.57" – Centering Ring Counter Bore: 0.86"

NW25 (KF25) OD: 1.57" – Centering Ring Counter Bore: 1.03"

NW20 Flanges Are Sometimes Used Overseas (Uncommon)

Aluminum Adaptive Centering Ring
NW20 to NW25
(NW20-25-AAR-S)
NW20-25-AAR-S$9.50