33mm-38mm Beige Drilled Silicone Stopper Plugs for Flask Test Tube Stopper 2 Pieces

Descriptions:
1. Not easy to deform, moderate hardness, manufactured according to standards, environmentally friendly materials
2.High elasticity, good insulation and sealing performance, high temperature resistance ,acid and alkali resistance, will not dissolve and swell in acidic liquids.
3.Normal using: Can be used to block glass ports, pipe mouths, fish tank openings, etc.