Check-All Valve Mfg. Co. (West Des Moines, IA) has introduced the new Vacuum Flange Insert (VI) for rough to high vacuum systems, systems requiring frequent cleaning or modification, roughing and foreline plumbing, and research and teaching lab applications – among others. The VI is designed to fit between ISO/NW/KF/QF vacuum flanges designed in accordance with DIN 28403, DIN 28404, ISO 1609 and ISO 2861. It is both a centering ring and a check valve so it requires no additional space in the line. Its size makes it extremely economical when compared to full-bodied check valves. The VI can also be used as a low-pressure relief valve under either positive or vacuum conditions by using the desired spring setting.