EPA Screw Vial Assembled Kit, 40mL clear glass EPA vial with cap and seal Aijiren Tech™. Select the right vial for water analysis application using EPA guidelines. Aijiren Tech™ EPA Screw Vial Convenience Kits are available in assembled and unassembled convenience kits to save you time during sample preparation. Choose from Level 100, 200 (pre-cleaned), or 300 (pre-cleaned and certified) clear or amber glass EPA vials with 20mL and 40mL total volume capacity.