Ideal Vacuum | Sample-Seal U-Tube Liquid Sample Holders, 5/8 inch OD, HV Valves, #15 O-ring Joint Flanged Includes two 0-4 mm High Vacuum Valves with O-Ring on Tip., High Vacuum Storage Sample
Absorption Tube, Calcium Chloride U-form Stoppered, 100 mm, dia 12 mm — Eisco Labs
SR Aquaristik Glass U Tube for Aquarium CO2 Tubing – SR Aquaristik.com