The Plasson Metric To Imperial Slip Coupling 7418 (20mm - 1/2in) is a specialized transition and repair fitting designed to join a modern 20mm metric MDPE water supply pipe directly to a legacy 1/2-inch imperial pipe, while also accommodating slip movement for inline repairs. It is widely utilized by plumbing, utility, and agricultural professionals during system maintenance, network extensions, or property renovations where new metric infrastructure must interface smoothly with older low-density imperial pipework without internal pipe stops blocking the slide path.
 
Manufactured from high-grade virgin polypropylene, this coupling provides exceptional impact strength, environmental stress resistance, and complete immunity to rust or corrosion. The internal mechanism features specialized split rings and captive O-ring seals engineered to accommodate the distinct outer diameters and wall characteristics of both metric and imperial tubing, ensuring a uniform mechanical clamping force and preventing tube pull-out under operational pressure or ground movement.
 
Engineered for rapid, straightforward installation on site, the slip design allows technicians to slide the fitting fully onto a cut pipe during repairs or tie-ins where lateral movement is restricted. Fully WRAS-approved for wholesome potable water distribution and rated for high working pressures up to 16 bar (PN16), this trade-quality slip coupling delivers reliable, leak-free performance across mixed-material water networks.