SEAFLO 3/4”, Black (2-pack) Thru Hulls Fitting Thru-Hull with Check Valve , Polypropylene + Glass-filled Nylon, 4-Year Warranty High Impact Resistance: The combination of polypropylene and glass-filled nylon not only ensures durability but also provides significant impact resistance. These materials absorb and disperse the forces encountered in the marine environment, preventing cracking and damage Built-In Check Valve: Each fitting features a built-in check valve that prevents backflow, enhancing the safety and efficiency of your vessel’s drainage systems. This vital feature helps maintain the integrity of internal systems by preventing water from re-entering the boat Exceptional Material Quality: Constructed from a blend of polypropylene and glass-filled nylon, these thru-hull fittings offer enhanced strength and durability. This combination of materials ensures excellent resistance to corrosion and UV degradation, making them ideal for sustained use in marine environments. Easy Installation: The simple yet robust design of the thru-hull fittings makes them easy to install, even in tight corners and narrow areas. This user-friendly feature saves time and effort during setup, allowing you to get back to sailing quicker. Upgrade your marine vessel with the SEAFLO Thru-Hull Fittings, expertly designed to provide superior durability and performance. Available in multiple sizes and colors, these fittings are made from high-quality polypropylene and glass-filled nylon, ensuring they withstand harsh marine conditions. Equipped with a reliable check valve, these thru-hull fittings are perfect for various applications in ships, yachts, and boats, enhancing safety and functionality.