standard ground stoppers

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Conical ground joint stoppers, borosilicate glass 3.3

NS-Glass stoppers, hollow borosilicate glass 3.3

Conical ground joint stoppers, borosilicate glass 3.3

Hollow stoppers, hexagonal plate, pointed bottom, borosilicate glass 3.3

Conical ground joint stoppers, borosilicate glass 3.3

NS-Glass stoppers, hollow borosilicate glass 3.3