Centering Ring, Compatible Tube Outer Diameter 1 in, Includes Screen No, Inner Ring Material Stainless Steel, Maximum Operating Temperature 320 Degrees F, Recommended Sterilization Autoclave, Compatible Flange Outside Diameter 1 37/64 in, Vacuum Rating 10-7 torr @ 72 Degrees F, Standards GB4982-ISO-K, Minimum Operating Temperature 4 Degrees F