... heat insulated,top off- center votical agitator,conical head,airtight manhole, breather valve,digital readout thermometer,anti-eddy ... heat insulated,top off- center votical agitator,conical head,airtight manhole, breather valve,digital readout thermometer,anti-eddy ... heat insulated,top off- center votical agitator,conical head,airtight manhole, breather valve,digital readout thermometer,anti-eddy ...