Omega OSTW thermocouple wire connectors are round pin standard size, 2 pole TC connectors designed to connect TC wire or temperature sensor instrumentation with a temperature controller or process control HMI automation panel. They are compatible with any other similarly sized Male, 2 prong thermocouple plug or 2 pin Female thermocouple jack . The female TC jack is Universal and will accept either the mini or standard size male TC plug. Hollow pins of thermocouple compensating alloy are used. This TC connector is also available with a solid 2 pin design.