Culture tube made from tubing with uniform wall thickness for maximum heat transfer and chemical resistance. Thread finish complies with Glass Packaging Institute (GPI) requirements. Cap has a PTFE-faced rubber liner and is not attached. Designed from ASTM E982, Type VI, Class B requirements. Replacement caps are 45066C. 25mL Capacity to Neck. O.D. x L (mm): 20 x 125. GPI Thread: 18-415. Kimble #: 45066A-20125.