By GRAYL, this GeoPress One-Way Electrolyte and Drink-Mix Valve was released in April 2023 for use in a GRAYL 24 oz GeoPress Water Filter & Purifier Bottle. It is only compatible with the 2nd generation GeoPress Filter & Purifier Cartridge that include a new "core" and "flow channel" design with horizontal vents (sold separately beginning April 2023). 1st generation cartridges are not compatible with the Drink-Mix Valve. A feature no other drink-thru filter bottle can deliver, the GeoPress One-Way Valve allows electrolytes and sport drink mixes to be added to clean purified water without compromising the integrity of the filter. Also allows a GeoPress to be used with a variety of flavored drinks such as juice, bubbly water, mocktails and cocktails. Weight: .42 oz (12 g). Size: 2.25" (5.8 cm) H x 1" (2.6 cm) W. Made from BPA-freefood-grade silicone. Compatible with GRAYL 24 Fl Oz GeoPress Filter & Purifier Bottle. Package contains one GeoPress One-Way Electrolyte and Drink-Mix Valve and a Care & Use Manual. Designed in Seattle, WA, and made in China. Patent-pending.