![Ideal Spectroscopy | Centering Ring Assembly KF-16 with Screen, ISO-KF Flange Size NW-16, Stainless Steel & Viton® O-Ring, 4 micron 88396 Ideal Spectroscopy | Centering Ring Assembly KF-16 with Screen, ISO-KF Flange Size NW-16, Stainless Steel & Viton® O-Ring, 4 micron 88396](https://www.idealvac.com/files/images/FineFilter-CenteringRing-DN40-ISO-KF40-4mic_88398.jpg)
Ideal Spectroscopy | Centering Ring Assembly KF-16 with Screen, ISO-KF Flange Size NW-16, Stainless Steel & Viton® O-Ring, 4 micron 88396
![Centering Ring, NW25, Fluorocarbon-based fluoroelastomer (FKM / FPM), Aluminum | MDC Precision | MDC Precision Centering Ring, NW25, Fluorocarbon-based fluoroelastomer (FKM / FPM), Aluminum | MDC Precision | MDC Precision](https://www.mdcprecision.com/media/catalog/product/cache/4ed3665eb49b6d2f975d77affd7b0bfd/7/1/710014.jpg)
Centering Ring, NW25, Fluorocarbon-based fluoroelastomer (FKM / FPM), Aluminum | MDC Precision | MDC Precision
![Ideal Spectroscopy | Centering Ring KF-16 Vacuum Fittings, ISO-KF Flange Size NW-16, Stainless Steel & Buna, O-Ring Ideal Spectroscopy | Centering Ring KF-16 Vacuum Fittings, ISO-KF Flange Size NW-16, Stainless Steel & Buna, O-Ring](https://www.idealvac.com/files/images/CenterRingKF16.jpg)
Ideal Spectroscopy | Centering Ring KF-16 Vacuum Fittings, ISO-KF Flange Size NW-16, Stainless Steel & Buna, O-Ring
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
![Ideal Vacuum | ISO 250 Centering Ring Stainless Steel with Viton O-Ring, NW-250 Vacuum Flange Size, Typically Used with 10 Inch O.D. (254 mm) Tubing Ideal Vacuum | ISO 250 Centering Ring Stainless Steel with Viton O-Ring, NW-250 Vacuum Flange Size, Typically Used with 10 Inch O.D. (254 mm) Tubing](https://www.idealvac.com/files/images/Centering-Ring-ISO-160_01.jpg)
Ideal Vacuum | ISO 250 Centering Ring Stainless Steel with Viton O-Ring, NW-250 Vacuum Flange Size, Typically Used with 10 Inch O.D. (254 mm) Tubing
Centering Ring KF 16 With Viton® O-Ring, KF 16 (NW 16), Aluminum, The centering ring contains a rubber elastomeric o-ring. Those are also recognized as NW10, NW16, NW25, NW40, or KF-10 KF-16,
![Centering Ring KF-40 Vacuum Fittings, ISO-KF Flange Size NW-40, Aluminum & Buna O-Ring (lot of 1pcs): Amazon.com: Industrial & Scientific Centering Ring KF-40 Vacuum Fittings, ISO-KF Flange Size NW-40, Aluminum & Buna O-Ring (lot of 1pcs): Amazon.com: Industrial & Scientific](https://m.media-amazon.com/images/I/61GqnhnXsxL._AC_UF1000,1000_QL80_.jpg)
Centering Ring KF-40 Vacuum Fittings, ISO-KF Flange Size NW-40, Aluminum & Buna O-Ring (lot of 1pcs): Amazon.com: Industrial & Scientific
![Kurt J. Lesker Company | KF (QF) HV Centering Rings (Stainless Steel) | Enabling Technology for a Better World Kurt J. Lesker Company | KF (QF) HV Centering Rings (Stainless Steel) | Enabling Technology for a Better World](https://www.lesker.com/newweb/images/product_photos/Photo-HD-QF40_150_SRV_GP_std.jpg)
Kurt J. Lesker Company | KF (QF) HV Centering Rings (Stainless Steel) | Enabling Technology for a Better World
![810001, Centering Ring, NW100, ISO LF, Large Flange, Fluorocarbon-based fluoroelastomer (FKM / FPM), 304ss | MDC Precision | MDC Precision 810001, Centering Ring, NW100, ISO LF, Large Flange, Fluorocarbon-based fluoroelastomer (FKM / FPM), 304ss | MDC Precision | MDC Precision](https://www.mdcprecision.com/media/catalog/product/cache/4ed3665eb49b6d2f975d77affd7b0bfd/3/5/351010_cr_a_2.jpg)