KF40 NW40 QF40 High Vacuum Centering Ring w/ O-ring Gasket, Mesh Screen 20mesh

KF40 NW40 QF40 High Vacuum Centering Ring w/ O-ring Gasket, Mesh Screen Filter 20mesh

New, never used before.

Nominal sieve opening of 0.0331 inches (850 microns). Stainless Steel 304.

These KF-40 Centering Rings with screen vacuum fittings meet ISO-KF standards and have a flange size of NW-40. They protect vacuum systems from particulate contamination, both external and internal. Commonly used in foreline vacuum plumbing and process systems, they are also known as quick flange fittings due to their easy assembly.