Description Warranty Information Model BAC 3" and 5" Back Connected Industrial Bimetallic Thermometers: The BAC bimetallic thermometer features a 90° back angle, rear threaded connection design. These thermometers, with 304 stainless steel wetted parts, are rugged and commonly used in industrial, pulp and paper, food and beverage processing, HVAC, and OEM applications The standard connection is 1/2"-14 NPT, but others are available. The standard lens material is glass. Standard stem diameter, up to 12" long, is .25". Other available stem sizes are .24" (6mm), .32" (8mm), and .375" (9.52mm). Some temperature ranges are NSF certified. Heavy Duty Gauge Sizes: 3" and 5"Specification Sheet This product comes with a 1 year Warranty