The Vacuum Trap Complete #50 O Ring Joint 56mm OD x 275 mm Length CG-4513-12 by Chemglass is a high-quality glassware product designed for various laboratory settings. Made in the United States, this unit is intended for use in physical, dental, medical, microbiological, and biological laboratories. With a unique design and precise measurements, this vacuum trap is a reliable and essential component for laboratory experiments and research. The included o-ring joint ensures a secure and leak-proof connection for your laboratory needs.