standard ground stoppers

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Conical ground joint stoppers, borosilicate glass 3.3

Conical ground joint stoppers, borosilicate glass 3.3

NS-Glass stoppers, hollow borosilicate glass 3.3

NS-Glass stoppers, hollow borosilicate glass 3.3

Conical ground joint stoppers, borosilicate glass 3.3

Conical ground joint stoppers, borosilicate glass 3.3

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

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

Conical ground joint stoppers, borosilicate glass 3.3

Conical ground joint stoppers, borosilicate glass 3.3

NS-Glass stoppers, hollow borosilicate glass 3.3

NS-Glass stoppers, hollow borosilicate glass 3.3