The Fernco 3 CI SV Hub x 3 CI SV S40 Donut is a high-performance plumbing fitting designed for efficient drainage and waste management. This donut fitting connects cast iron (CI) pipes with a hub connection, ensuring a secure and leak-proof seal. Made from durable materials, it is engineered to withstand the rigors of wastewater systems while providing flexibility for installation. The 3-inch size is compatible with standard CI and S40 pipes, making it an essential component for both residential and commercial plumbing applications. This fitting meets industry standards for quality and reliability, ensuring optimal performance in any plumbing system.