Union Dry Cleaning Part 0901066 / PU090166 is a normally open nylon valve with O-ring for compatible Union, Realstar, Firbimatic, and FMB Group dry cleaning machines. The live listing title references a 1/2 inch nylon valve, while the original product notes also reference a 1 1/4 inch valve and COD 1841, so size should be verified against the existing valve before ordering. Use this listing for replacement only after matching the valve body, normal-open configuration, O-ring, and machine application.