standard ground stoppers
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