Functionality has been confirmed and the item is in working order. The item has been cleaned and deodorized, but please understand that it is a used item before purchasing. *Regarding parts and installation, everything is included for immediate installation. ・New packing rubber (for waterproofing): 2 pieces included. ・Water supply hose + branch fitting: 1 set ・Mounting bolts for toilet seat fixation: 2 bolts ・Detachable plate: 1 piece You do not need to purchase any additional parts. Installation tools can be purchased at Daiso for around 500 yen. This item has been tested and confirmed to be working, and the water in the tank has not been drained. Therefore, it may be slightly wet when it arrives. *Note: Because this is a used item, it is being listed immediately after functionality has been confirmed. Therefore, there is a possibility of defects occurring upon receipt. In the unlikely event that a defect occurs during installation within one week of the product's arrival, we will provide warranty support, including exchange, return, and refund. Everything in the photos is included. Please check carefully before purchasing. Please contact us as soon as possible after arrival. Thank you for your understanding.