Dixon 3 in. PTFE Seal for Cryogenic LNG Couplings - John M. Ellsworth Co. Inc.
Orings for low temperatures in cryogenic applications | PowerRubber.com
Ultra-Low Temperature 'O' rings | TRP Polymer Solutions
MedSchenker® external thread 2mL cryogenic vial with an O-Ring Screw Cap and Standing Base are RNase and DNase Free - Lab Supplies - Stellar Scientific
Making a Cryogenic-compatible O-ring seal | HYdrogen Properties for Energy Research (HYPER) Laboratory | Washington State University