Fernco 5002-66RC 6" Shielded Below Ground Sewer Pipe Coupling for Clay to Cast Iron, Plastic or Steel Plumbing Waste Connections About this item UNMATCHED QUALITY PERFORMANCE: Built to last the life of the plumbing system, Fernco Shielded Couplings are made from elastomeric polyvinyl chloride wrapped in 300 Series Stainless Steel for resistance to heavy earth loads and shear forces and provides improved pipe alignment. BELOW-GROUND PIPE CONNECTOR EXCELLENCE: Designed to resist heavy earth loads and shear forces, Fernco RC flexible couplings stand as the optimal choice for below-ground applications, ensuring unmatched durability and secure connections. CONNECT VARIOUS PIPE SIZES: To choose the right Coupling, measure the outside diameter (OD) of your pipe. This cap has an internal diameter (ID) of 7.5 and fits pipe ODs between 7.029-7.5 on one end and an ID of 6.65 and fits ODs between 6.179-6.65 on the other end. NO-MESS INSTALLATION: Fernco Couplings are easy to install without the hassle of messy primers, glues and their unwanted odors. VERSATILE SOLUTION: Tailored for sewer, drain, waste, and vent piping applications, guaranteeing exceptional performance across diverse plumbing needs. Maximum test pressure: 4.3 PSI.