15mm PIPE TO 3/8" FRIDGE WATER FILTER PIPE ADAPTER-PUSHFIT
This adapter will fit all 15mm copper pipe/ 15mm speedfit pipe, and HEP20, it is a simple pushfit connection, once fitted to your main supply you then just attatch the second 3/4" - 3/8" adapter and you are ready to go, being speedfit -pushfit connections it could not be easier.
A general knowledge of plumbing skills is all you need to fit this product. However if you are at all unsure then please consult a plumber.