The Waterpik Reservoir Assy Replacement CS Kit is a replacement water tank designed specifically for Waterpik WP-450 water flosser models. This transparent reservoir ensures continued optimal performance of your Waterpik device when the original tank needs replacement. Key features: • Compatible with Waterpik WP-450 models • Clear transparent design • Easy to install replacement part • Durable plastic construction • Maintains original device functionality This is an official Waterpik replacement part that helps extend the life of your water flosser. The reservoir is an essential component that holds the water used during flossing. Regular replacement of the reservoir may be needed due to wear and tear or damage to maintain proper functioning of your device.