Adapter Lower Ground Mouth Size 29/42 Upper Ground Mouth Size 29/42 Overall Length 130 mm USP Specification Type I Product Type Adapter Type Adapter Material Borosilicate Glass Color Clear Autoclavable No Features Allows Access to the Bottom of Flasks/Tubes Outer Standard Taper Joint at the Top and Inner Standard Taper Joint at the Bottom are the Same Size User May Shorten the Lower Tube to Fit the Flask or Apparatus Standards Not Applicable ASTM Specification E438