The 15mm x 10mm Speedfit Stem Reducing Coupler is a push-fit plumbing fitting designed to connect 15mm and 10mm pipework, typically used when transitioning between radiator tails, microbore pipes, or adapting to smaller branches in heating or water systems.
One end features a 10mm push-fit connection, while the other end is a 15mm stem, which fits directly into another 15mm push-fit fitting (like elbows, tees, or couplers).
Manufactured from tough, WRAS-approved plastic, this coupler is suitable for hot and cold water systems and central heating. Quick to install with no tools, flames, or flux required.
Key Features:
Size: 15mm stem x 10mm push-fit
Compatible with Speedfit and other push-fit systems
Ideal for reducing from 15mm to 10mm pipework
Tool-free installation – just push and connect
Suitable for hot & cold water and central heating systems
Made from WRAS-approved plastic
Demountable & reusable for flexible installations
No soldering or glue required – perfect for DIY and professionals
Specifications:
Connection Type: Push-fit
Fitting Style: Stem reducing coupler
Sizes: 15mm (stem) x 10mm (push-fit socket)
Material: Plastic (acetal / polybutylene)
Max Working Temperature: Typically 65–85°C (confirm brand specs)
