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14/20 Outer Joint Hollow glass stopper Hexagon Head Stopper; convenient to clean and rotate, and side grooves can prevent slippage Borosilicate Glass, Heavy Duty Design, Reusable and premium; maximum withstand temperature 200°C StonyLab ensures premium and premium customer service
14/20 Outer Joint Hollow glass stopper Hexagon Head Stopper; convenient to clean and rotate, and side grooves can prevent slippage Borosilicate Glass, Heavy Duty Design, Reusable and premium; maximum withstand temperature 200°C StonyLab ensures premium and premium customer service