Certified 20ML Long Neck Headspace Vials Restek-HPLC Test Vials. Certified Vial Kit: 1.5ml 20ml Headspace-Vial, 75.5 x 22.5mm, clear glass, 1st Crimp Neck Headspace -Vials and Aluminum Crimp Seals ND20. Restek crimp neck vial chromatography-Aijiren Sample Vials Beveled-neck headspace vials are available in both 10 mL and 20 mL capacities, flat