Red Rubber Stoppers Solid 21mm - Pack of 10 Pack of ten
Best quality Red Rubber. Shore hardness in range 46-55. Bottom diameter moulded on top face.
• Bottom diameter: 21mm
• Top diameter: 24.5mm
• Length: 28mm
• Pack of 10
Size 21 stoppers are ideal to use with Pyrex HD NM Conical Flasks 125mL and Simax NM flasks 50-100mL.