15mm PIPE TO 1/4" FRIDGE WATER FILTER PIPE ADAPTER-PUSHFIT This is a John Guest 3/4" BSP x 15MM PUSHFIT STRAIGHT ADAPTER sold with a John Guest 3/4"x FEMALE - 1/4"WATER PIPE REDUCER. 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 attach the second 3/4" - 1/4"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.