The 4" SJ900 SWING CHECK E from Apollo Conbraco Industries is a reliable swing check valve designed for effective backflow prevention in various piping systems. This valve features a 4-inch diameter, making it suitable for medium flow applications. Constructed from high-quality materials, it ensures durability and compliance with industry standards. The swing check mechanism allows for smooth operation, while the threaded connections enhance installation ease. Ideal for use in water, oil, and gas systems, this valve is essential for maintaining system efficiency.