This vintage Pyrex Corning vacuum connecting adapter is a must-have for any collector or enthusiast of lab glass adapters and connectors. Made of high-quality glass, this adapter is durable and reliable, ensuring a secure connection for any vacuum or pressure system. With its 24/40 joints, it is compatible with a wide range of Pyrex glassware and plasticware, making it a versatile addition to any lab or industrial setting. Whether you're a medical professional or a researcher, this adapter is an essential tool for your work. These particular pieces were used at a municipal water treatment facility.