Use this easy guide to quickly identify the appropriate rubber stoppers or corks for your glassware & plasticware. Beakers & Flasks | Test Tubes
| Size | #-holes (size) | Top dia. | Bottom dia. | Fits product |
|---|---|---|---|---|
| Rubber Stoppers | ||||
| 00 | 1-hole (3 mm) | 15 mm | 10 mm | Small test tubes |
| 00 | 2-holes (3 mm) | 15 mm | 10 mm | Small test tubes |
| 0 | Solid | 17 mm | 13 mm | Large test tubes |
| 0 | 1-hole (3 mm) | 17 mm | 13 mm | Large test tubes |
| 0 | 2-holes (3 mm) | 17 mm | 13 mm | Large test tubes |
| 1 | Solid | 19 mm | 14 mm | 50 ml Pyrex flasks |
| 1 | 1-hole (5 mm) | 19 mm | 14 mm | 50 ml Pyrex flasks |
| 1 | 2-holes (4 mm) | 19 mm | 14 mm | 50 ml Pyrex flasks |
| 2 | Solid | 20 mm | 16 mm | X-large test tubes, 300 mm Graham & 300 mm Liebig Condenser |
| 2 | 1-hole (3 mm) | 20 mm | 16 mm | X-large test tubes, 300 mm Graham & 300 mm Liebig Condenser |
| 2 | 2-hole (3 mm) | 20 mm | 16 mm | X-large test tubes, 300 mm Graham & 300 mm Liebig Condenser |
| 3 | Solid | 24 mm | 18 mm | 50 ml, 100 ml HST Erlenmeyer flasks, 1-2 L soda bottles |
| 3 | 1-hole (4 mm) | 24 mm | 18 mm | 50 ml, 100 ml HST Erlenmeyer flasks, 1-2 L soda bottles |
| 3 | 2-holes (4 mm) | 24 mm | 18 mm | 50 ml, 100 ml HST Erlenmeyer flasks, 1-2 L soda bottles |
| 5 | Solid | 27 mm | 23 mm | 125 ml Erlenmeyer flasks |
| 5 | 1-hole (5 mm) | 27 mm | 23 mm | 125 ml Erlenmeyer flasks |
| 5 | 2-holes (5 mm) | 27 mm | 23 mm | 125 ml Erlenmeyer flasks |
| 6.5 | Solid | 34 mm | 27 mm | 250 ml, 500 ml Erlenmeyer | Florence | Filtering flasks |
| 6.5 | 1-hole (5 mm) | 34 mm | 27 mm | 250 ml, 500 ml Erlenmeyer | Florence | Filtering flasks |
| 6.5 | 2-holes (5 mm) | 34 mm | 27 mm | 250 ml, 500 ml Erlenmeyer | Florence | Filtering flasks |
| 8 | Solid | 41 mm | 33 mm | 500 ml Pyrex flasks |
| 8 | 1-hole (5 mm) | 41 mm | 33 mm | 500 ml Pyrex flasks |
| 8 | 2-holes (5 mm) | 41 mm | 33 mm | 500 ml Pyrex flasks |
| 9 | Solid | 45 mm | 37 mm | 1000 ml HST Erlenmeyer Flasks |
| 9 | 1-hole (5 mm) | 45 mm | 37 mm | 1000 ml HST Erlenmeyer Flasks |
| 9 | 2-holes (5 mm) | 45 mm | 37 mm | 1000 ml HST Erlenmeyer Flasks |
| 10 | Solid | 49 mm | 42 mm | Fits many vacuum bottles, 2000 ml HST Erlenmeyer Flask |
| 10 | 1-hole (5 mm) | 49 mm | 42 mm | Fits many vacuum bottles, 2000 ml HST Erlenmeyer Flask |
| 10 | 2-holes (5 mm) | 49 mm | 42 mm | Fits many vacuum bottles, 2000 ml HST Erlenmeyer Flask |
| Cork Stoppers | ||||
| 2 | Solid (use borer) | 13 mm | 9 mm | Small test tubes |
| 4 | Solid (use borer) | 16 mm | 12 mm | Large test tubes |
| 6 | Solid (use borer) | 19 mm | 14 mm | X-large test tubes, 50 ml Pyrex flasks |
| 9 | Solid (use borer) | 24 mm | 18 mm | 50 ml, 100 ml HST Erlenmeyer flasks, 1-2 L soda bottles |
| 14 | Solid (use borer) | 32 mm | 25 mm | 250 ml HST Erlenmeyer flasks, 500 ml Erlenmeyer flasks |