Sets contain: 1 – Straight tube with removable in. 1/4 in. I.D. hose connection 1 – Single-bulb ball-tube flask 1 – Round-bottom oven flask 2 – PBT/PTFE screw-thread connectors 3 – Solid-top caps, PBT with PTFE liner PBT/PTFE connectors resist heat to 200 °C and may be used interchangeably with 1- and 2-liter glassware. Special "reverse threading" on these flasks prevents connections from loosening during rotation.
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