Blue Screw-On Collar for Modular Glass Burettes

This durable blue screw-on collar (nut) is designed for use with Delta burette models 49BU50 and 49BURAG50 (Mk2). It securely fastens both the top graduated glass tube and bottom glass jet to the stopcock assembly, ensuring a stable, leak-free connection.

An essential replacement part for routine maintenance or refurbishment of burette assemblies.