The Plasson Compression Adaptor to Copper 7438 (20mm x 15mm) is a dedicated transition fitting designed to connect a 20mm metric MDPE (Medium Density Polyethylene) water supply pipe directly to 15mm copper pipework. It is widely utilized by plumbing and utility professionals during domestic mains entries, property refurbishments, or service upgrades where an external plastic water main interfaces with internal metallic plumbing systems.
 
Manufactured from high-grade virgin polypropylene combined with specialized metal-to-plastic transition components, this adaptor provides exceptional impact strength, environmental stress resistance, and complete immunity to rust or electrochemical corrosion. The MDPE side features Plasson's standard compression mechanism with a captive O-ring seal and split ring, while the copper side utilizes a purpose-designed grip and seal assembly tailored specifically for the rigid outer diameter of standard 15mm copper tube.
 
Engineered for rapid, straightforward installation on site, the fitting eliminates the need for hot works, soldering, or press-fit tools when transitioning between plastic and copper lines. Fully WRAS-approved for wholesome potable water applications and rated for working pressures up to 16 bar (PN16), this trade-quality adaptor delivers a reliable, long-term, leak-free connection across domestic and commercial water infrastructure.