Kimble kimax dispensing burets large capacity kimble kimax burets / burettes used for dispensing laboratory solvents or solutions for a variety of clinical and industrial applications. Supplied with a chemically-resistant, self-lubricating ptfe stopcock easy-to-read durable white ceramic enamel scale replacement 4 mm straight bore stopcock plug is 821001-0004 manufactured from 33 expansion, low extractable borosilicate glass conforming to usp type i and astm e438, type i, class a requirements. Warning: this product can expose you to chemicals including tetrafluoroethylene, which are known to the state of california to cause cancer. Prop 65 warning