This fitting will connect 20mm MDPE to 15mm or 22mm copper tube. It can also be used to connect 20mm MDPE to 3/8” and ½” sizes of the other materials listed below.These fittings are extremely flexible in their use - universal transition fittings enable you to make swift and easy connections from our MDPE pipe to most other commonly used materials in water supply services. This includes copper, lead, alkathene, PE, PVC, ABS, stainless steel and galvanised iron.No extra adaptors are needed to make the connection, although a pipe liner should be used on the MDPE side of the fitting.This fitting is WRAS approved.