This Plasson Mechanical Compression Conversion Set is designed for connecting water mains pipes and any water supply pipes in infrastructure, agriculture, and horticulture. It facilitates a conversion from a 20mm pipe to a 15mm pipe, providing a quick and easy installation with no tools required. The adaptor creates a watertight seal within cold water systems and offers a secure grip on the pipe. It is made from durable plastic, resists sub-zero temperatures, and has been tested to withstand working pressures of up to 16 bar. WRAS approved.