8 mm Starburst Plugs for Shell Vials, 1.0mL WISP 96 Style, 8 x 40mm Restek Compare this item 9mm Solid Top Polyethylene Closures Restek Compatible with all 9 mm screw-thread vials. Molded, 10-mil, solid pierceable cap. PTFE-free—ideal for PFAS analysis (e.g., EPA 537) and other PFAS-sensitive methods. Related Products: Pierceable Compare this item