Premium Nylon Component Crafted from black nylon , this marine vent excellent Erosion resistance and Protect, ideal for harsh saltwater and humid environments with long lasting durability. 5/8 Inch Standard Fit Designed for 5/8 inch (16mm) hoses with a 12mm inner diameter, ensuring tight Connection for bilge, drainage, and ventilation systems without leaks. Anti Backflow Design a duckbill Styles slanted vent head to seawater backflow, splash intrusion, and debris buildup while maintaining efficient Flows . Easy Installation Equipped with barbed fittings and a hexagonal nut for tool Easy tightening, making boat maintenance and upgrades quick and Easy . Versatile Application Perfect for yachts, boats, , and campers, suitable for bilge ventilation, drainage outlets, cabin air exchange, and other marine plumbing needs.