Vacuum Sealing Drainage bags seal and stick with a vacuum so belts are not needed. Vacuum is achieved using air pressure from a high pressure air source. Venturi vacuum generator is included with the kit as well as a gauge and shut off valve. Hoses are sold separately.
The vacuum sealing chamber seals the outside perimeter of the bag so the inner low pressure chamber is used to drain fluid from the central chamber. The inner chamber will cover holes up to 8" diameter.