VWR VOC vials caps and septum-Voa Vial Supplier Manufacturer. VWR 40ml VOA vials with caps and septum-Voa Vial Supplier EPA vials with PP cap. The EPA vials are ideal for water . 40ml TOC Vial. We offer TOC vials certified to contain less than 10 Parts Per Billion (PPB) and less than 20 Parts Per Billion (PPB) for use for pharmaceutical and biotechnology applications. Product Name.