Husky® has designed a new folding frame tank liner called the “PRO500®”, patent pending. The PRO500® is designed with mega capacity in mind. There are specially designed “bladders” that are welded to the sidewalls of the liner that when deployed will add approximately 500 gallons of much-needed capacity to the original size of your tank. The standard PRO500® liner has four bladders installed, two on each folding side. When deployed, the bladders extend out from the frame creating the extra capacity.
 
Each bladder can be deployed on its own. If you have space issues on one side of the tank only deploy the opposite side and still get approximately 250 gallons added. The bladders are secured with a unique strapping system that allows them to be rolled up in a non-usable mode. When you are ready to store your PRO500® tank, secure the bladders with the strapping system and it will fit in your standard Portable Tank Rack.