The Series I-4 Weatherproof Immersion Assemblies are designed for harsh environments where dust, condensation, vapor, oil and other contaminants may be present. The assembly combines a powder coated steel enclosure with a fast response RTD sensor for immersion temperature applications. The probe is constructed of 304 SS in a 6" (15 cm) length. Use the brass adaptor supplied with each unit to adjust the immersion depth of the probe. The Series I-4 can be threaded directly into a 1/2" NPT well (sold separately) or 1/2" saddle fitting.