standard ground stoppers

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Conical ground joint stoppers, borosilicate glass 3.3

Conical ground joint stoppers, borosilicate glass 3.3

Conical ground joint stoppers, borosilicate glass 3.3

Conical ground joint stoppers, borosilicate glass 3.3

Conical ground joint stoppers, borosilicate glass 3.3

Conical ground joint stoppers, borosilicate glass 3.3

Conical ground joint stoppers, borosilicate glass 3.3

Conical ground joint stoppers, borosilicate glass 3.3

Conical ground joint stoppers, borosilicate glass 3.3

Conical ground joint stoppers, borosilicate glass 3.3

Conical ground joint stoppers, borosilicate glass 3.3

Conical ground joint stoppers, borosilicate glass 3.3