See the seller's listing for full details. unopened and undamaged item in original retail packaging. 80 psig, 5 - MKS 100316306 Overpressure Ring. Condition:: New: A brand-new, it may be delivered in non-retail packaging. New / Unused <br /> <br />Buyer will receive all 5 rings, unused, <br /> <br />MKS 100316306 <br />Overpressure Ring, such as a plain or unprinted box or plastic bag, where packaging is applicable, 304 Stainless Steel, 304SS, If the item comes direct from a manufacturer, Country/Region of Manufacture: : United States: MPN: : 100316306, NW50 ISO-KF Flange, See all condition definitions : Brand: : MKS. 80 psig, NW50 ISO-KF Flange.