Johnson Controllers Mechanical Temperature Controller A28AA-9C Two Stage w/ Fixed Differential, 2-SPDTThe A28 Series are two stage mechanical temperature controls that incorporate a liquid filled sensing element. Features: wide temperature ranges availableconstant differential throughout the entire rangeSPDT snap-acting switchesunaffected by changes in barometric pressureunaffected by cross ambient conditionscompact enclosurevariety of sensing element styles Product Specifications BRANDJohnson Controls CAPILLARY LENGTH FEET6 BULB SIZE INCHES3/8 x 5 DIFFERENTIAL TEMPERATURE °F3.5 Ea. Stage, 3 Between Stages TEMPERATURE CONTROL RANGE °F20 to 80 VOLTAGE240 / 120 NEMA RATING1 RANGE ADJUSTERKnob STAGES2 SWITCH ACTION2 - SPDT TYPEHeat & Cool LISTING, RATING, CERTIFICATIONUL Listed LIMITED WARRANTY YEARS1 MANUFACTURER'S PART NUMBERA28AA-9C