Fits
between the packing nut (Part #J-4120-01) and the sealing shaft (Part
#J-4121) to keep the packing firmly compressed in Pines Winterfront thermostats. For use on many radiators
which use the Pines Automatic Winterfront Shutter Thermostat.
OAL: .580
Wire DIA: .073
OD: .540
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