STOPPERS RUBBER TWO HOLE BOTTOM DIA 31MM

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: 31mm
• Top Diameter: 36mm
• Length: 35mm
• Temperature Range: -30°C - 70°C
• Hole Diameter: 5mm
• Pack of 10

Size 31 stoppers are ideal to use with Economy NM Flasks 100mL, Pyrex NM Conical Flasks 250-500mL and simax side Arm 250mL.

Please note: Extreme care must be used when inserting glass into the holes in rubber stoppers.