The Plasson Coupler features push-fit connections that allows for a simple installation, no tools are required, and you simply insert the MDPE or copper pipes into the relevant inserts. The durable, plastic design has impressive strength and stress resistance, providing a long lasting connection that will keep a system leak free. Machined to withstand 16 bar pressure, the reducing adaptor is not suitable for hot water systems, but can withstand sub-zero temperatures.