Conflex Risers are designed to meet or exceed pressure rating of PE pipe per 49 CFR Part 192 and ASTM D2513;Conflex Risers conform to trench depth and flex with ground movement;Conflex Risers may be installed with or without meter set present;Conflex Risers have a swivel feature to allow tightening the Service Head Adapter without turning the flex hose;Service Head Adapter design has been used in the natural gas industry since 1967;Conflex Risers meet the requirements of;ASTM D 2513, D.O.T. Title 49 of the Code of Federal Regulations, Part 192.283 (b) and 192.375;NFPA 54 and NFPA 58