Obtuse Elbow The Tectite range of remountable obtuse elbows have been designed to withstand the rigorous demands of the mechanical services sector. Manufactured from DZR brass. Provides an electrical continuity. For use in the mechanical services sector on hot and cold services, heating and chilled water applications and low temperature hot water services. These fittings can be used with copper tube, PB and PEX pipe, chrome plated copper tube or carbon steel WRAS approved What is WRAS Approval? Whole products such as valves, boilers & showers undergo mechanical and water quality testing. This type of approval demonstrates full compliance with requirements of the regulations and byelaws, provided the fitting is installed according to any conditions given with the approval.