O-ring large seat insert - 185-028-12 71537

185-028-12
Larger of the two orings found on the Seat Insert of the Erie 541 and 542 type valves.
NOTE: also the size o-ring used in the Fleck / Rainsoft Turbine Meter Assembly 3/4 Electronic 19797 ( or assembly 60626 ) around the Turbine internally, and some times leaks. Cross reference Rainsoft PN 52130