Durable PP construction Made from quality polypropylene (PP) for strong resistance to deformation, delivering dependable, longterm performance in garden and knapsack sprayer setups. Improved stability and efficiency The pressure relief function enhances overall system stability and helps improve the working efficiency of knapsack sprayers by maintaining steady pressure during operation. Overpressure protection for the bottle When pressure rises above the safe threshold, the valve automatically vents to deflate and protect the bottle body from damage. Easy to install and Directly old or damaged air release valves Easy to install and disassemble, helping to improve the stability of the spraying system Specifications and compatibility Material: PP (polypropylene) Function: Pressure relief and automatic venting to protect the sprayer bottle Applications: Garden sprayers and knapsack sprayers; designed to old or damaged air release valves Use scenarios Lawn and garden care: worn valves in knapsack sprayers used for pesticide, herbicide, or fertilizer applications to maintain consistent performance and reduce downtime. Larger area spraying: Use in farm or largeproperty sprayers to sustain stable pressure and steady spray, cutting pump effort and improving application consistency. Greenhouses and orchards: Provides overpressure protection during pressure spraying, helping prevent damage to the sprayer bottle and ensuring safe, reliable operation.