Flowserve 001210.158.000 Seat Ring MK1, a 4-inch replacement part for Flowserve MK1 valves. The TN 3.50 designation and CL 150 600 ECO labeling specify its sizing and service ratings for standard industrial piping. This MK1 seat ring provides the critical sealing surface against the valve seat to control flow and enable shutoff in downstream systems.
