The Plasson Plass4 Universal Coupling (20-27mm x 25mm) is an advanced, highly versatile transition fitting designed to join a 25mm metric MDPE water supply pipe directly to alternative pipe materials spanning 20mm to 27mm outside diameters. It is predominantly utilized by plumbing and utility professionals during infrastructure repairs, retrofits, or service upgrades to seamlessly link modern plastic mains to legacy materials such as copper, lead, galvanised steel, or PEX.
 
Manufactured from a robust, high-grade copolymer polypropylene, this coupling provides exceptional impact resistance, structural longevity, and complete immunity to corrosion. The fitting incorporates precision-engineered NBR rubber seals and specialized gripping components (such as polyacetal split rings) that adapt securely to varying outer diameters, ensuring a firm mechanical hold without requiring specialized welding or conversion adapters.
 
Engineered for rapid, tool-free on-site assembly, the coupling simplifies complex transitions while maintaining reliable hydraulic performance under pressure. Fully certified to international standards (such as ISO 17885) for cold water applications and rated for working pressures up to 16 bar, this trade-quality universal coupling delivers dependable, leak-free performance in demanding underground chambers and outdoor utility environments.