Compression Fittings Are Made According To Standards En 712 / 713 / 715 / And Iso 3501 / 3503 / 3458 /3459 And Are Suitable For Installation On Pe Pipes Conforming To Iso 11922; Din 8072 / 8074; And Une 53131. These Fittings Allow For A Quick; Simple Insertion Of The Tube; Considerably Reducing Installation Time: Simply Loosen The Nut (Without Removing It); And Insert The Pipe.