The Wavin OsmaSoil 2S399G 40mm Ring Seal Boss Adaptor in grey is a high-quality PVCu fitting designed for secure connections in domestic and commercial soil and waste systems. Engineered for compatibility with OsmaSoil drainage pipes, this adaptor ensures a reliable, leak-free joint between different pipe sections or appliances. Ideal for bathrooms, kitchens, and utility installations, the 2S399G simplifies pipework alignment and provides long-lasting performance in professional plumbing and DIY projects.