Hep2O HD1/15W 15mm Straight Connector - The Hep2O range is a fully tried and tested system and has been the first choice of professional plumbers in the UK for over 30 years. With many unique and patented features, Hep2O is the most technologically advanced fitting on the market. Guaranteed for 50 years against defects in materials and manufacturing, Hep2O has evolved and is now recognised as the professional’s system of choice.