This is the replacement cartridge "RS-1SGE" for the Seagull IV high-performance water purifier. Compatible with all older X-1 series models (excluding X-1BE/X-1DE). RS-1SGE is a replacement cartridge that removes viruses, bacteria, chemicals, etc., providing safe and delicious water. Regular cartridge replacement ensures consistently high purification performance. [Condition] Unused and unopened. There are minor scuffs on the box from storage, but the contents are fine. The unit itself is like new. [Compatible Models] Compatible with X-1 and X1-series main units. (X-1BE and X-1DE are not compatible, so please check the compatible models before purchasing.) [Shipping] Carefully packed with waterproofing and cushioning material, and shipped promptly via Sagawa Express. Immediate purchase OK! You can buy it directly without commenting. For those seeking safe and secure water, please consider this product. Thank you for viewing until the end. If you have any questions, please feel free to comment. We look forward to your purchase. If shipping to Okinawa Prefecture, an additional shipping fee of 1,000 yen will be required in addition to the standard shipping fee. We kindly ask for your prior contact before purchasing.