The 4" Clay to 4" Plastic Adaptor is a robust, flexible coupling designed to transition between traditional 4" (110mm nominal) vitrified clay drainage pipes and modern 4" plastic systems (typically PVC-U or HDPE). Ideal for underground foul and surface water applications, it ensures a watertight seal and accommodates differential movement between materials. Engineered for fast installation and long-term durability, it’s a go-to solution for repairs, upgrades, and mixed-material drainage layouts.