PURPOSE: To measure a gas purging cock in a reliable state by heat-conductively connecting pot type metallic sleeves to the gas purging cock by engaging the sleeves with recessed sections provided in the bottom section of the cock and inserting temperature sensors heat-conductively connected to the metals of the sleeves into the sleeves.

CONSTITUTION: One or more openings 9 for temperature sensors 12 of the metallic bottom section 5 are airtightly sealed with pot type metallic sleeves 10 which are opened in the outward direction of the bottom section 5. Then the sleeves 10 are heat-conductively connected to the gas purging cock by engaging the sleeves 10 with recessed sections 8 provided on the bottom face of the cock. In addition, the temperature sensors 12 which are heat-conductively connected to the metals of the sleeves 10 are inserted into the sleeves 10. When the gas purging cock is heated, consequently, the sleeves 10 are also heated and the temperatures of the sleeves 10 are transmitted to the sensors 12. Therefore, the gas purging cock can be measured in a reliable state.