It is designed for use with flat flange vessels in laboratory applications. Manufactured from high-quality Duran borosilicate glass 3.3, this lid offers exceptional chemical and thermal resistance. It features a central neck (NS 29/32) and three angled side necks (NS 29/32), allowing for versatile connections to various laboratory apparatus. The lid ensures a tight closure due to standard ground joints and is autoclavable for sterilization, making it ideal for reactions, distillations, and evaporations requiring pressure or vacuum conditions.