Replacement for waterflosser works for waterpic water pick waterpick water pic WP-462, WP463, WP468, WP465, WP450. Keep your Waterpik with factory pressure pressure.Don't let the water stain and residue reduce factory setting pressure. No more mold or bacteria in your reservoir/ tank If your reservoir is round shape, then you are buying the right one. Please make sure your water flosser device was purchased 2021 or before. Check the 2nd picture to identify the version. Replace Reservoir/ Tank every 6 months for hygienic recommendation and efficiency. Compatible models: waterpic Ultra WP462, WP463, WP468, WP465, WP450. Gasket/Valve/Rubber included. Note: For first time use or when water stops flowing through the gasket, please use your finger or blunt item to push the grommet down compltetly to allow to water flow down into your waterpic instead of leaking.