Both the filling and overflow tubes accept 1/4 inch ID flexible tubing

·         Filled through a self-lubricating, chemically-resistant PTFE stopcock plug

·         Easy-to-read durable black ceramic enamel scale

·         Replacement stopcock is 823001-0002

·         Ref: ASTM Method D1744

·         Designed from ASTM Specification E287, Class B requirements

·         Manufactured to the specifications found in ASTM E694

·         Calibrated to the accuracy requirements found in ASTM Specification E542

·         Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements