Chromatography Vials and Caps - EPA Vials & Caps We offer the best prices on 40ml Amber Screw top vials 27.5mm x 95mm, EPA Vials & Caps. Product Title Description Part No. Pack Size Price Add To Basket White open screw cap (24-414 thread) with bonded Silicone/PTFE septa (0.060" thick) (EPA grade)