RUBBER STOPPER NO. 21 FOR BOILING TUBE (CHOICE OF SOLID OR 1-HOLE)
Durable red solid rubber stoppers, designed for professional lab use but versatile enough for home or garage applications. Made from chemical-resistant rubber, safe for use with acids, alkalis, and ammonia. Easy to clean and stable in temperatures ranging from -20°C to 70°C.
Specifications:
(All measurements are approximate)
Top Diameter: 25mm
Bottom Diameter: 20mm
Length: 27mm
Quantity: Pack of 10
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