Red PTFE/white silicone septa + black non-porous cap for 4ml screw top sample vials. 15x45mm vials have 13-425 GPI threads and can hold up to 4ml samples. Use 13 x 425 bottle caps with septa for sample vials and diffusion caps for rinsing bottles. These vials have a closed top screw seal and can also be used as storage vials.
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