This pumps bellows set features duckbill valves that effectively prevents liquid backflow, ensuring optimal vacuum systems Designed for marine toilets, it delivers stable operations in various environments Perfect for camping vehicles and marine vessels, this replacement set ensures efficient toilet systems operations during travels Suitable for vacuum generators including models S12D, T32, and others The set includes high strength polyurethane components with resistance and aging protections, outlasting standard parts Silicone O rings maintain excellent sealing across 40℃ to 120℃ temperature ranges With a drainage capacity of 25L per minutes, this component enables fast flushing without clogging concerns Tested at normal pressure, it maintains functionality even under extreme conditions, minimizing failure risks Made with adaptable materials, the corrugated tube accommodates multiple installation angles and space constraints for easy setup Its structure operates below 75dB, ensuring quiet ideal for nighttime use