Professional Check Valve for Airtight Odor Control and Sewer Backflow Prevention

Professional Check Valve for Airtight Odor Control and Sewer Backflow Prevention. Anti-Backflow Design: Equipped with a gravity-operated valve that opens for drainage and snaps shut to prevent sewage backflow and pest intrusion. Triple Barrier Protection: Combines a Premium ABS Framework, Silicone Ring, and Flange Gasket to create a 100% airtight seal against sewer odors, gases, and rodents. Universal 3-4 Inch Fit: Compatible with standard 3-inch and 4-inch underground sewer pipes for versatile toilet installations. Easy DIY Installation: Simple structure supports quick, tool-free installation for new projects, repairs, and replacements. Custom OEM/ODM Service: Supports customized colors, sizes, logos, packaging, and product specifications for private-label projects. 17 Years Expertise: Backed by nearly two decades of specialized manufacturing experience in the sanitary ware industry, ensuring professional-grade quality and reliability.