Centering Ring KF 25 With Viton® O-Ring, KF 25 (NW 25), Stainless Steel, The centering ring contains a rubber elastomeric o-ring. Those are also recognized as NW10, NW16, NW25, NW40, or KF-10
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Amazon.com: KEX Single 25" inch Wheel ORing 15.5x25, 17.5X25, 20.5X25 Earth Mover Grader Tire O-Ring : Automotive
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20PC/lot Rubber Ring NBR Sealing O-Ring 5mm OD22/25/28/30/32/34/35/36/38/40/42/45/48/50mm Nitrile O Ring Seal Oring Gasket Ring - AliExpress
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20PC/lot Rubber Ring NBR Sealing O-Ring 5mm OD22/25/28/30/32/34/35/36/38/40/42/45/48/50mm Nitrile O Ring Seal Oring Gasket Ring - AliExpress
![High Temperature Silicone Rubber O ring (1 pair) for 25-26 mm dia Alumina or Quartz Tube - EQ-SOR-25 High Temperature Silicone Rubber O ring (1 pair) for 25-26 mm dia Alumina or Quartz Tube - EQ-SOR-25](https://www.mtixtl.com/images/products/display/25mmORing..jpg)
High Temperature Silicone Rubber O ring (1 pair) for 25-26 mm dia Alumina or Quartz Tube - EQ-SOR-25
![Ideal Vacuum | Centering Ring O-Ring Viton Replacement KF-25 Vacuum Fittings, ISO-KF Flange Size NW-25 Ideal Vacuum | Centering Ring O-Ring Viton Replacement KF-25 Vacuum Fittings, ISO-KF Flange Size NW-25](https://www.idealvac.com/files/images/BlackO-Ring_1.jpg)