After using it for 4 years, it started leaking water drop by drop from the joint marked with a circle (◯). I purchased a replacement cartridge (worth 11,000 yen), but I ended up installing a different showerhead with a shower function, so this cartridge is no longer needed. It was very difficult for a novice like myself to disassemble and replace, so it remains in its removed state. There are scratches, dirt, and deterioration of the rubber parts due to use. A replacement cartridge is required for use. As I am a novice, I do not know if there are any missing parts or malfunctions. Please understand and agree to these conditions before purchasing.