Perkin Elmer1⁄4 in. (6.4 mm) External Screw Thread Adapter with 1.8 mm O.D. Nipple, Type KSKU · B0507918
Perkin Elmer1⁄4 in. (6.4 mm) Internal Screw Thread Adapter with 1.8 mm O.D. Nipple, Type ASKU · B0193342