- 6513C60 stopper was traditionally offered by Thomas for 300/500 mL combustion flasks; glass tip extends 50 mm below ground joint
- 6513C65 stopper is used for 1,000 mL combustion flasks; glass tip extends 90 mm below ground joint
All feature U-shaped platinum gauze with 3 mm opening for insertion of the sample wrapper. For replacement Platinum Carrier, see Thomas number 6514F55.