Daily Thermetrics’ Model 150 Socket Weld and Weld-In Thermowells are constructed from a single piece of solid bar stock and are designed to be in direct contact with the process. They require field welding and are best suited for permanent installations. The thermowell diameter is designed to fit standard socket weld connections. Designed for use with thermocouples, RTDs, bimetallic thermometers, and other instrumentation devices. All aspects of the thermowell are customizable.