There are four seals to prevent water from leaking on the side of the piston. RUST ANTI-RUST: Made of solid brass and the polished gold surface can do well prevent rusting even in water. EASY INSTALLATION: You can divide the item without accessories, which makes installation easier. HIGH-QUALITY SPRING The good spring ensures that the piston that can't come out won't go through. EASY INSTALLATION: All necessary accessories are included and the installation steps are simple. p>