The Hand-Held Thermosealer by BioSeal Systems is required for use with the System5 containment material. This tool creates a fully hermetic seal when used as directed. Plug in the heat sealer and set to the highest heat setting (Level 8). When sealing, press each section for up to 3 seconds to ensure a tight seal. Check for the presence of channels in your seal to ensure the bag is sealed hermetically. Made in the USA.