Commercial electric thermostat 200-550F, 36" Capillary, 3/16" X 16-1/8" Nickel Bulb, direct acting (switch contacts open on temperature rise). factory Model K-128. The 5300 Series Standard Thermostat is a SPST, snap-acting control.Replaces SAVORY EQUIPMENT 21281,1 TO 10 DIAL (NARROW)