Durable and Reusable Material: Made of silica gel, which is soft and strong enough to last for a long time. Valueable Pack: Pack of 6, you will receive 6 replacement parts. To keep your mouth healthy, we recommend changing the gasket every 3 months. Easy to Install and Use:This reservoir valve rubber gasket makes the lid sit tighter and not easily fall off when the lid is opened to add water. Compatible Models: It can be compatible with Waterpik WP-100, WP-112, WP-114, WP-150, WP-260, WP-270, WP-300, WP-305, WP-310, WP-462, WP-900, WP-72C, Ultra, Nano, Traveler, VAVA, H2ofloss, etc. Warm Notice: Please make sure the model number is compatible before purchase.