A 15 x 12mm compression fit reducing coupling is a reliable plumbing fitting designed to connect a 15mm pipe directly to a 12mm pipe in a straight line without the need for any soldering.
Installation is quick and tool-friendly, requiring only standard spanners to tighten the nuts, which securely compresses the internal olives to create a tight, watertight transition between the two different pipe diameters.
It is ideal for altering plumbing layouts, adapting standard water supply or heating lines to smaller branch pipes—such as those used for specific taps, appliances, or smaller distribution lines—and working effectively with copper, polyethylene, and other compatible piping materials.