High‑quality Wavin OsmaS PVCU Boss Adaptor BK 50 S/S (2S402B) – robust unplasticised PVC‑U boss adaptor for secure 50 mm soil and waste pipe connections. Ideal for above‑ground drainage, plumbing installations and ring‑seal pipe systems, this fitting delivers reliable performance and easy, leak‑proof integration into OsmaS systems. Suitable for residential and commercial plumbing projects.