LOW TEMPERATURE SHUTOFF (PNEUMATIC) MODEL 135-B,BRASS HEAD,BRONZE THERMAL ELEMENT; STD 1/2"-NPT-MALE INSERTION CONNECTION; BR/SST/CU INTERNAL TRIM,FLUOROSILICONE (FK) SEALS,SST SPRING WASHERS, INVAR ROD; SPECIAL CALIBRATION RANGE; PER SPQ NUMBER 57528 WITH SPECIAL SET POINT CALIBRATION -19 DEG C (-2.2 DEG F);