Material and durability: Made of PP material that is strong, sturdy, and dependable in use. It resists deformation and is suitable for long term service. Performance benefits: Improves work efficiency of knapsack sprayers by providing reliable pressure relief, helping you complete spraying tasks more quickly and with less downtime. Automatic deflation and protection: Automatically deflates when the pressure exceeds a preset value, effectively protecting the bottle body and reducing the risk of over pressurization. Easy installation and replacement: Simple to install and remove, and can directly old or damaged air release valves to restore stability and reliable operation. Compatibility and use: Designed for knapsack and garden sprayers. Directly replaces worn or damaged air release valves on compatible models to maintain performance. Use scenarios Field or large area spraying: In agricultural or landscaping work, the valve provides steady pressure during continuous spraying and allows quick deflation after use, minimizing interruptions and downtime. Home garden maintenance: Replacing a worn valve in a garden sprayer improves spray consistency and reduces the chances of leaks, making routine yard work more efficient. Nursery or greenhouse operations: In environments with frequent refills or usage, the safety relief valve offers automatic pressure relief to protect the container and gear, helping maintain reliable operation.