5pcs KF-40 NW-40 Vacuum Center Ring made of SS304 with O-ring 

Centering ring material: Stainless steel 304
Working temperature: -20C to 200C / -15F to 400F
Hardness 70-75
Centering Ring KF-40 Vacuum Fittings, ISO-KF Flange Size NW-40, Stainless Steel & O-ring
Package Included: 5 x KF40 Stainless steel 304 Centering Ring and O-ring
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