Best quality red rubber. Shore hardness in range 46-55. Bottom diameter moulded on top face. Resistant to dilute acids, alkalis and ammonia.
Bottom Diameter: 33mm
Top Diameter: 38.5mm
Length: 39mm
Temperature Range: -30°C – 70°C
Pack of 10
Size 33 stoppers are ideal to use with Economy NM Flasks 250mL, Pyrex HD NM Conical Flasks 1000mL, Pyrex Flat/Round Bottom NN Flasks 1000mL, Simax NM Flasks 250-500mL and Simax WM Flasks 250mL.



































