Screw thread graduated media/storage bottles come assembled with phenolic PTFE-faced 14-B white rubber-lined closures. With a large white marking spot.

Screw thread graduated media/storage bottles come assembled with polypropylene closures welded to PTFE/Silicone liners. Closures are ideal for repeated autoclaving. The PTFE/Silicone liner also eliminates the possibility of glue contamination. With a large white marking spot.