Ace Glass Incorporated branded claisen adapter with glass stopcock. Center tube has a 10/30 outer top joint for a 76 mm immersion thermometer, and a 24/40 inner bottom joint. This adapter has a 75 degree take-off arm with a 24/40 outer top joint, and a stopcock side arm but with no valve. The joint size of this valve is featured in the second image on this listing. This item is used but is in great condition.