Patent ID: 8469221

Claim:
An insert for a pressurized fluid container comprising a product chamber for receiving an additive, said product chamber being laterally surrounded by a pressure chamber in at least a region of the pressure chamber proximate to a cover, the pressure chamber having an opening oriented toward the outside of the pressure chamber, said opening being located above the fluid level of the pressurized fluid container when the fluid container contains fluid and the insert is floating in the fluid container, the cover for closing the product and pressure chambers, said cover including seals which engage side walls of the pressure and product chambers at a constant distance from a respective side wall end, said engagement creating a sealing line on the side wall of the pressure chamber and a sealing line on the side wall of the product chamber, wherein a first distance between the sealing line on the side wall of the pressure chamber and the pressure chamber side wall end is greater than a second distance between the sealing line on the side wall of the product chamber and the product chamber side wall end, wherein the seals between the cover and the product chamber wall and between the cover and an exterior wall of the pressure chamber extend in a circular fashion at a substantially constant height around the respective walls, and wherein the product chamber and the pressure chamber are fixed to each other so they maintain a relatively fixed geometrical position.